Updated on 2022/07/01

写真a

 
NOGAMI Yoshio
 
Organization
Faculty of Natural Science and Technology Professor
Position
Professor
External link

Degree

  • 理学修士 ( 1987.3   東京大学 )

  • 理学士 ( 1985.3   京都大学 )

  • 理学博士 ( 東京大学 )

Research Interests

  • 構造物性

  • 結晶構造

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

  • Natural Science / Magnetism, superconductivity and strongly correlated systems  / 低次元物質

  • Natural Science / Magnetism, superconductivity and strongly correlated systems  / トポロジカル半金属

Education

  • The University of Tokyo   理学系研究科   相関理化学専攻

    1985.4 - 1989.3

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    Country: Japan

  • Kyoto University   理学部   物理学科

    1981.4 - 1985.3

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    Country: Japan

Research History

  • Okayama University   自然科学学域   Professor

    2004.4

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    Country:Japan

  • Nagoya University   理学部

    2012.4 - 2013.3

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    Country:Japan

  • パリ南大学   研究員

    2006.6 - 2006.11

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    Country:France

  • パリ南大学   研究員

    1996.3 - 1996.7

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    Country:France

  • Okayama University   理学部   Associate Professor (as old post name)

    1993.4 - 2004.3

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    Country:Japan

  • パリ南大学   研究員

    1992.11

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    Country:France

  • Kyoto University   理学部   Research Assistant

    1989.4 - 1993.3

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    Country:Japan

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Professional Memberships

Committee Memberships

  • 日本物理学会   代議員  

    2013.4 - 2015.3   

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    Committee type:Academic society

 

Papers

  • Highly isotropic in-plane upper critical field in the anisotropic s-wave superconductor 2H-NbSe2 Reviewed

    S. Yasuzuka, S. Uji, S. Sugiura, T. Terashima, Y. Nogami, K. Ichimura, S. Tanda

    J. Supercond. Nov. Magn.   2019.11

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    Resistivity measurements for a layered transition metal dichalcogenide 2H-NbSe2 were performed to investigate the in-plane anisotropy of the upper critical field (Hc2) for magnetic fields up to 14.5 T at temperatures down to 2.0 K. For fields rotated within the basal plane, the in-plane anisotropy of a characteristic field H∗ (defined as the field strength at which the resistivity reaches zero) showed twofold symmetry at low temperatures. On the basis of this result, the in-plane anisotropy of Hc2 and the superconducting gap structure in 2H-NbSe2 are discussed.

    DOI: 10.1007/s10948-019-05333-z

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  • Multiple charge density waves compete in ternary rare-earth nickel carbides, RNiC2 (R: Y, Dy, Ho, and Er) Reviewed

    Maeda Hiroyuki, Kondo Ryusuke, Nogami Yoshio

    PHYSICAL REVIEW B   100 ( 10 )   2019.9

  • A new strategy for inducing dipole moments in charge-transfer complexes: introduction of asymmetry into axially ligated iron phthalocyanines Reviewed

    Masaki Matsuda, Sayaka Iwamura, Yumi Hamada, Hiroko Ohishi, Miki Nishi, Yoshio Nogami, Mitsuo Ikeda, Akinori Kanda, Yusuke Funasako, Tomoyuki Mochida, Akiko Nakao, Noriaki Hanasaki

    DALTON TRANSACTIONS   46 ( 35 )   11800 - 11805   2017.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Introduction of asymmetry into charge-transfer complexes composed of axially ligated iron phthalocyanines was achieved. In the obtained crystals of TPP[Fe-III(Pc)(CN) Cl](2), TPP[FeIII(Pc)(CN) Br](2), and TPP [Fe-III(Pc) BrCl](2) (TPP = tetraphenylphosphonium and Pc = phthalocyanine), the axial positions of the iron atoms were occupied by 50/50 ratios of the ligands CN/Cl, CN/Br, and Br/Cl, respectively. The crystal structures of the obtained CT complexes were isostructural to those composed of the symmetric analogues of the type [Fe-III(Pc) L-2] (L = CN, Cl or Br); the [FeIII(Pc) LL'] units formed regular one-dimensional chains along the c-axis following the symmetry of the P4(2)/n space group. Despite forming similar regular chains to the symmetric systems, the electrical resistivities and activation energies were enhanced in the obtained CT complexes compared to those in symmetric systems, indicating that the charge-ordered states were stabilised by the introduction of asymmetry. More specifically, the dielectric relaxation behaviour of the inhomogeneous disordered TPP[FeIII(Pc)(CN) Cl](2) probably suggests that a dipole moment was induced in this material.

    DOI: 10.1039/c7dt02605f

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  • Interplay between charge density wave and antiferromagnetic order in GdNiC2 Reviewed

    N. Hanasaki, S. Shimomura, K. Mikami, Y. Nogami, H. Nakao, H. Onodera

    PHYSICAL REVIEW B   95 ( 8 )   2017.2

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    The correlation between the charge density wave (CDW) and f local moments is observed in GdNiC2 by means of x-ray diffraction in a magnetic field. Various kinds of electronic states exist in the magnetic field. The intensity of the CDW peak changes in the successive transitions and the commensurate-incommensurate transition of the CDW takes place as well. The successive transitions are explained in terms of a cooperative effect of the Peierls instability and the spin Friedel oscillation, in which the antiferromagnetic order of the f local moments is coupled to the spin density wave coexisting with the CDW of the conduction electron.

    DOI: 10.1103/PhysRevB.95.085103

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  • Possible charge order structure of stoichiometric YbFe2O4 Reviewed

    Kosuke Fujiwara, Tomoyuki Karasudani, Mamoru Fukunaga, Hiroyuki Kobayashi, Jun Kano, Pierre-Eymeric Janolin, Jean-Michel Kiat, Yoshio Nogami, Ryusuke Kondo, Naoshi Ikeda

    FERROELECTRICS   512 ( 1 )   85 - 91   2017

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    We report a possible charge ordering model of triangular mixed valence material YbFe2O4. It was found that a crystal synthesized with high stoichiometry on iron vacancy shows new and simple extinction rule in the superlattice reflections. The Laue class of the diffraction signal is expressed as 2/m. With the consideration of the charge neutrality and the superlattice signal of (1/3 1/3 0), we derived 5 possible charge ordering models of this material.

    DOI: 10.1080/00150193.2017.1349945

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  • Observation of all-in type tetrahedral displacements in nonmagnetic pyrochlore niobates Reviewed

    S. Torigoe, Y. Ishimoto, Y. Aoishi, H. Murakawa, D. Matsumura, K. Yoshii, Y. Yoneda, Y. Nishihata, K. Kodama, K. Tomiyasu, K. Ikeda, H. Nakao, Y. Nogami, N. Ikeda, T. Otomo, N. Hanasaki

    PHYSICAL REVIEW B   93 ( 8 )   2016.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    We observed all-in type Nb tetrahedral displacement in nonmagnetic pyrochlore niobates A(2)Nb(2)O(7) (A = Nd0.5Ca0.5 and Y0.5Ca0.5) through the analysis of the neutron pair distribution function and the extended x-ray absorption function spectroscopy. The all-in type Nb tetrahedral displacement, which has the character of a charge singlet state, is driven by the formation of the bonding orbital. The diffuse scattering in the x-ray diffraction, which has the resonant component in the Nb L-3 edge, indicates that the all-in type Nb tetrahedral displacement has the periodicity with its short-range correlation.

    DOI: 10.1103/PhysRevB.93.085109

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  • Development of x-ray monochromatic Laue Camera under magnetic fields at low temperatures,and its application to Ternary Rare-Earth Nickel Carbides, RNiC2

    Kondo Ryusuke, Ai Yukio, Nogami Yoshio

    Meeting Abstracts of the Physical Society of Japan   71   1806 - 1806   2016

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.71.2.0_1806

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  • Photoinduced switching to metallic states in the two-dimensional organic Mott insulator dimethylphenazine-tetrafluorotetracyanoquinodimethane with anisotropic molecular stacks Reviewed

    Matsuzaki Hiroyuki, Ohkura Masa-aki, Ishige Yu, Nogami Yoshio, Okamoto Hiroshi

    PHYSICAL REVIEW B   91 ( 24 )   2015.6

  • Photoinduced switching to metallic states in the two-dimensional organic Mott insulator dimethylphenazine-tetrafluorotetracyanoquinodimethane with anisotropic molecular stacks Reviewed

    Hiroyuki Matsuzaki, Masa-aki Ohkura, Yu Ishige, Yoshio Nogami, Hiroshi Okamoto

    PHYSICAL REVIEW B   91 ( 24 )   2015.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    A photoinduced phase transition was investigated in an organic charge-transfer (CT) complex M2P-TCNQF(4), [M2P: 5,10-dihydro-5,10-dimethylphenazine, donor (D) molecule; TCNQF(4): 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane, acceptor (A) molecule] by means of femtosecond pump-probe reflection spectroscopy. This is an ionic compound and has a peculiar two-dimensional (2D) molecular arrangement; the same A (or D) molecules arrange along the [100] direction, and A and D molecules alternately arrange along the [111] direction. It results in a strongly anisotropic two-dimensional electronic structure. This compound shows a structural and magnetic phase transition at 122K below which the two neighboring molecules are dimerized along both the [100] and [111] directions. We demonstrate that two kinds of photoinduced phase transitions occur by irradiation of a femtosecond laser pulse; in the high-temperature lattice-uniform phase, a quasi-one-dimensional (1D) metallic state along the AA(DD) stack is generated, and in the low-temperature lattice-dimerized phase, a quasi-2D metallic state is initially produced and molecular dimerizations are subsequently released. Mixed-stack CT compounds consisting of DA stacks are generally insulators or semiconductors in the ground state. Here, such a dynamical metallization in the DA stack is demonstrated. The release of the dimerizations drives several kinds of coherent oscillations which play an important role in the stabilization of the lattice-dimerized phase. The mechanisms of those photoinduced phase transitions are discussed in terms of the magnitudes of the anisotropic bandwidths and molecular dimerizations along two different directions of the molecular stacks.

    DOI: 10.1103/PhysRevB.91.245140

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  • 23pBE-12 Observation of Charge Singlet State in Pyrochlore Niobates

    Torigoe S., Aoishi Y., Murakawa H., Matsumura D., Yoshii K., Yoneda Y., Kodama K., Ikeda K., Tomiyasu K., Nakao H., Otomo T., Nogami Y., Hanasaki N.

    Meeting Abstracts of the Physical Society of Japan   70   2325 - 2325   2015

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.1.0_2325

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  • 22pBA-17 Hall Effect of the rare-earth compounds, RNiC_2(R=La, Ce)

    Nomura K., Kondo R., Nogami Y.

    Meeting Abstracts of the Physical Society of Japan   70   2234 - 2234   2015

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.1.0_2234

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  • Interplay of Charge-Density Wave and Magnetic Order in Ternary Rare-Earth Nickel Carbides, RNiC2 (R = Pr and Nd) Reviewed

    Nobuki Yamamoto, Ryusuke Kondo, Hiroyuki Maeda, Yoshio Nogami

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82 ( 12 )   2013.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    The electrical and structural properties of NdNiC2 and PrNiC2 are examined in single-crystalline samples in order to investigate the interplay of charge-density wave (CDW) and magnetic order in ternary rare-earth nickel carbides, RNiC2, where R is a rare-earth element. PrNiC2 (no magnetic order down to 1.5 K) and NdNiC2 [antiferromagnetic (AF) transition at 17.2 K] show resistance anomalies at 89 and 121 K, respectively, which are revealed to be CDW transitions by observing X-ray satellite reflections. NdNiC2 also shows a gradual decrease in both resistivity and CDW amplitude below the Neel temperature. In the AF phase, the magnetoresistance sharply decreases where a ferromagnetic (FM) order occurs, which is realized above the spin-flop magnetic field. These results clearly suggest that the relationships between CDW and magnetic order in RNiC2 depend on whether the magnetic order is AF or FM.

    DOI: 10.7566/JPSJ.82.123701

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  • X-ray crystal structure analysis and Ru valence of Ba<inf>4</inf>Ru <inf>3</inf>O<inf>10</inf> single crystals Reviewed

    Taichi Igarashi, Yoshio Nogami, Yannick Klein, Gwenaelle Rousse, Ryuji Okazaki, Hiroki Taniguchi, Yukio Yasui, Ichiro Terasaki

    Journal of the Physical Society of Japan   82 ( 10 )   2013.10

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    We present a single-crystalline x-ray diffraction study on Ba4Ru3O10 consisting of corner-shared Ru3O12 trimers. The crystal structure is redetermined from 78 to 300K across an antiferromagnetic transition at 105 K. The orthorhombic symmetry (Cmca, space group No. 64) is preserved at all temperatures measured. This structure presents exceptionally long Ru-O distances characterized by a significant distribution within the Ru 3O12 trimer. A bond valence sum calculation suggests that the charge disproportionation within the Ru3O12 trimer emerges even at room temperature, which we ascribe to molecular orbital formation in the Ru3O12 trimer, as supported by the results of recent theoretical calculations. On the basis of the analyzed crystal structure, the electronic states and the nature of the phase transition at 105K are discussed. © 2013 The Physical Society of Japan.

    DOI: 10.7566/JPSJ.82.104603

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  • Emergence of superconductivity at 45 K by lanthanum and phosphorus co-doping of CaFe2As2 Reviewed

    Kazutaka Kudo, Keita Iba, Masaya Takasuga, Yutaka Kitahama, Jun-ichi Matsumura, Masataka Danura, Yoshio Nogami, Minoru Nohara

    SCIENTIFIC REPORTS   3   1478   2013.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATURE PUBLISHING GROUP  

    Co-doping of lanthanum and phosphorus in CaFe2As2 induces superconductivity at 45 K. This superconducting transition temperature is higher than the 38 K transition in Ba1-xKxFe2As2, which is the maximum found thus far among the 122 phases. Superconductivity with a substantial shielding volume fraction was observed at 0.12 &lt;= x &lt;= 0.18 and y = 0.06 in Ca1-xLaxFe2(As1-yPy)(2). The superconducting phase of the present system seems to be not adjacent to an antiferromagnetic phase.

    DOI: 10.1038/srep01478

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  • Thermoelectric Effect in Hexagonal Tungsten Oxides Reviewed

    T. Okusako, T. Tokuyama, K. Mikami, Y. Nogami, N. Hanasaki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81   2012.12

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    We synthesize hexagonal tungsten oxides CsxWO3 (x = 0.12 similar to 0.33) by the hydrothermal method and investigate their thermoelectric property. The title compounds show the metallic behavior. The Seebeck coefficient increases near the band edge in the small cesium ratio x. The maximal value of the power factor and the dimensionless figure of merit ZT are about 3 mu W/K(2)cm and 0.03, respectively.

    DOI: 10.1143/JPSJS.81SB.SB028

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  • Magnetic field switching of the charge-density-wave state in the lanthanide intermetallic SmNiC2 Reviewed

    N. Hanasaki, Y. Nogami, M. Kakinuma, S. Shimomura, M. Kosaka, H. Onodera

    PHYSICAL REVIEW B   85 ( 9 )   2012.3

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    In the intermetallic SmNiC2, the ferromagnetic metallic state competes with the charge-density-wave state. We can switch the charge-density-wave state by applying a magnetic field that is conjugated to the magnetization of the order parameter in the ferromagnetic state, and show the giant negative magnetoresistance. Under the applied magnetic field, the resistivity becomes one order of magnitude smaller than the zero-field resistivity.

    DOI: 10.1103/PhysRevB.85.092402

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  • Optical and structural studies of a two-dimensional organic Mott insulator dimethylphenazine-tetrafluorotetracyanoquinodimethane

    M. Ohkura, Y. Ishige, R. Sawada, H. Matsuzaki, H. Matsuzaki, Y. Nogami, H. Nishikawa, M. Yamashita, S. Horiuchi, S. Horiuchi, H. Okamoto, H. Okamoto, H. Okamoto

    Physical Review B - Condensed Matter and Materials Physics   84   2011.8

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    Electronic structure of an organic charge-transfer complex, M 2P-TCNQF4 (M2P: 5,10-dihydro-5,10- dimethylphenazine; TCNQF4: 2,3,5,6-tetrafluoro-7,7,8,8- tetracyanoquinodimethane), was investigated by means of optical reflection spectroscopy and x-ray structural analyses. This is an ionic compound and has a unique quasi-two-dimensional (2D) crystal structure in which donor (D) molecules of M2P and acceptor (A) molecules of TCNQF4 stack respectively along the [100] direction, and D and A molecules also stack alternately along the [111] direction. We evaluated the transfer energy t(AA) between the neighboring A molecules, t(DD) between the neighboring D molecules along the [100] direction, and t(DA) between the neighboring D and A molecules along the [111] direction to be 43 meV, 29 meV, and 67 meV at room temperature, respectively. This demonstrates that an anisotropic 2D electronic structure is formed. By comparing the spectra of the imaginary part of the dielectric constant ε2 obtained from the polarized reflectivity spectra with the absorption spectrum of K-TCNQF4 and the ε2 spectra of M2P-PF6, which are composed of 1D A stacks and D stacks, respectively, it was revealed that in M2P-TCNQF4 the optical gap corresponds to the Mott gap transition from A- to A-, and the D+ to D+ transition and the A - to D+ transition or equivalently the charge-transfer (CT) transition located at the higher energies. Below the structural and magnetic phase transition temperature Tc ∼ 122 K, spin-singlet states are formed via displacements of both D and A molecules. The pattern of molecular displacements was found to be very unique, indicating that the phase transition cannot be attributed to a spin-Peierls-like mechanism. The nature of the phase transition is discussed from the temperature dependences of molecular displacements as well as of the Mott-gap transition and the CT transition. © 2011 American Physical Society.

    DOI: 10.1103/PhysRevB.84.085136

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  • Optical and structural studies of a two-dimensional organic Mott insulator dimethylphenazine-tetrafluorotetracyanoquinodimethane Reviewed

    M. Ohkura, Y. Ishige, R. Sawada, H. Matsuzaki, Y. Nogami, H. Nishikawa, M. Yamashita, S. Horiuchi, H. Okamoto

    PHYSICAL REVIEW B   84 ( 8 )   2011.8

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    Electronic structure of an organic charge-transfer complex, M2P-TCNQF(4) (M2P: 5,10-dihydro-5,10-dimethylphenazine; TCNQF(4): 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane), was investigated by means of optical reflection spectroscopy and x-ray structural analyses. This is an ionic compound and has a unique quasi-two-dimensional (2D) crystal structure in which donor (D) molecules of M2P and acceptor (A) molecules of TCNQF(4) stack respectively along the [100] direction, and D and A molecules also stack alternately along the [111] direction. We evaluated the transfer energy t(AA) between the neighboring A molecules, t(DD) between the neighboring D molecules along the [100] direction, and t(DA) between the neighboring D and A molecules along the [111] direction to be 43 meV, 29 meV, and 67 meV at room temperature, respectively. This demonstrates that an anisotropic 2D electronic structure is formed. By comparing the spectra of the imaginary part of the dielectric constant epsilon 2 obtained from the polarized reflectivity spectra with the absorption spectrum of K-TCNQF(4) and the epsilon(2) spectra of M2P-PF6, which are composed of 1D A stacks and D stacks, respectively, it was revealed that in M2P-TCNQF(4) the optical gap corresponds to the Mott gap transition from A(-) to A(-), and the D+ to D+ transition and the A(-) to D+ transition or equivalently the charge-transfer (CT) transition located at the higher energies. Below the structural and magnetic phase transition temperature T-c similar to 122 K, spin-singlet states are formed via displacements of both D and A molecules. The pattern of molecular displacements was found to be very unique, indicating that the phase transition cannot be attributed to a spin-Peierls-like mechanism. The nature of the phase transition is discussed from the temperature dependences of molecular displacements as well as of the Mott-gap transition and the CT transition.

    DOI: 10.1103/PhysRevB.84.085136

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  • Successive Transition in Rare-earth Intermetallic Compound GdNiC(2) Reviewed

    N. Hanasaki, K. Mikami, S. Torigoe, Y. Nogami, S. Shimomura, M. Kosaka, H. Onodera

    INTERNATIONAL CONFERENCE ON FRUSTRATION IN CONDENSED MATTER (ICFCM)   320   2011

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    In GdNiC(2), the magnetic state is investigated under the high magnetic fields and the low temperatures. We find the intermediate phases, in which the magnetization value is close to a half of the full moment, and the successive transition in the phase boundary between the antiferromagnetic, the metamagenetic, and the paramagnetic phases. The mechanism of the intermediate phase is discussed.

    DOI: 10.1088/1742-6596/320/1/012072

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  • X-ray Absorption Spectra in Pyrochlore Niobates Reviewed

    S. Torigoe, Y. Ishimoto, N. Hanasaki, Y. Nogami, D. Matsumura, K. Yoshii, Y. Yoneda, Y. Nishihata

    INTERNATIONAL CONFERENCE ON FRUSTRATION IN CONDENSED MATTER (ICFCM)   320   2011

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    The X-ray absorption spectra reveal that the valence of the Nb ion, and the displacement of the Nb ions from the center of the oxygen octahedra in the pyrochlore niobates YCaNb(2)O(7) and NdCaNb(2)O(7), which is consistent with the previous report of the neutron diffraction.

    DOI: 10.1088/1742-6596/320/1/012078

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  • Hydrothermal Synthesis of Hexagonal Vanadium Oxide Reviewed

    T. Tokuyama, T. Okusako, K. Mikami, N. Hanasaki, Y. Nogami

    INTERNATIONAL CONFERENCE ON FRUSTRATION IN CONDENSED MATTER (ICFCM)   320   2011

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    We synthesize the hexagonal vanadium oxide containing the alkaline-metal ion (Li, Na, and K). The crystal belongs to the magnetoplumbite-type structure. The title compound, in which the vanadium valance is not an integer, shows the metallic and the paramagnetic behavior. The electronic specific heat coefficient gamma is 34.7 mJ/K(2)mol, which is perhaps due to the spin fluctuation.

    DOI: 10.1088/1742-6596/320/1/012073

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  • Field-Induced Successive Phase Transitions in the Charge Density Wave Organic Conductor HMTSF-TCNQ Reviewed

    Keizo Murata, Keiichi Yokogawa, Kensuke Kobayashi, Kosuke Masuda, Takahiko Sasaki, Yuki Seno, Natarajan Rani Tamilselvan, Harukazu Yoshino, James S. Brooks, Denis Jerome, Klaus Bechgaard, Mikio Uruichi, Kyuya Yakushi, Yoshio Nogami, Reizo Kato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 10 )   2010.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    The magnetoresistance of quasi-1D two-chain organic conductor HMTSF-TCNQ (hexamethylenetetraselenafulvalene-tetracyanoquinodimethane), which shows charge density wave transition at ambient pressure, was studied under pressure up to 27 T and 31 T, in two high field facilities. We found a kink structure in the magnetoresistance reminiscent of field-induced spin density wave at an intermediate pressure of 1.5 GPa between 0 and 2 GPa. We speculate that these are successive quantum phases induced by magnetic field.

    DOI: 10.1143/JPSJ.79.103702

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  • Relaxation of geometrical frustration in NbSe3 topological crystals Reviewed

    T. Tsuneta, K. Yamamoto, N. Ikeda, Y. Nogami, T. Matsuura, S. Tanda

    PHYSICAL REVIEW B   82 ( 1 )   2010.7

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    Here we report the structural study of NbSe3 topological crystals via synchrotron x-ray measurements on individual microcrystals. Topological crystals are characterized by the shape of a ring or a twisted loop, thereby representing a translational and orientational order confined in topologically nontrivial, curved geometries. The crystal lattice of topological crystals is under considerable amount of strain. The volume-averaged strain asymptotically increases with thickness and curvature of a crystal. We present a structural model in which a ring crystal is composed of well-ordered domains in the shape of concentric cylinders. The internal structure reflects periodic accumulation and release of strain during the growth.

    DOI: 10.1103/PhysRevB.82.014105

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  • Pressure effect on the competing charge ordered states in theta-(BEDT-TTF)(2)CsZn(SCN)(4) Reviewed

    M. Watanabe, M. Osanai, Y. Dohi, Y. Ishikawa, Y. Noda, Y. Nogami, I. Terasaki, H. Mori, T. Mori

    PHYSICA B-CONDENSED MATTER   405 ( 11 )   S229 - S231   2010.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The pressure effect on the competing charge ordered states in theta-(BEDT-TTF)(2)CsZn(SCN)(4) was investigated by X-ray diffraction method Under 1 1 GPa the threefold long range ordered superstructure with the wave vector q(1) = (-2/3 0 1/3) was detected below 240 K and the twofold charge ordering with the wave vector q(2) = (0 0 1/2) was suppressed from 3 to 300 K by the pressure (C) 2010 Elsevier B V All rights reserved

    DOI: 10.1016/j.physb.2010.03.018

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  • Nonequilibrium charge ordering in theta-(BEDT-TTF)(2)MM '(SCN)(4) (M=Rb, Cs; M '=Co, Zn) Reviewed

    Ichiro Terasaki, Shuichi Tasaki, Shigeru Ajisaka, Yoshio Nogami, Noriaki Hanasaki, Masashi Watanabe, Hatsumi Mori, Takehiko Mori

    PHYSICA B-CONDENSED MATTER   405 ( 11 )   S217 - S220   2010.6

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    Giant nonlinear conduction in the charge ordered organic conductor theta-(BEDT-TTF)(2)MM'(SCN)(4) (M = Cs Rb M' = Co Zn) is analyzed in relation to the current-induced suppression of the charge ordered state characterized by a wave vector of q(2) = (0k 1/2) On the basis of a theory of the nonequilibrium Peierls transition the energy gap is calculated as a function of current density J(ext) which is found to depend weakly on temperature in an intermediate temperature range This justifies the evaluation of the found to be consistent with the calculation We compare the present results with nonequilibrium and Ail i IS charge-order energy gap Delta from the nonlinear resistivity rho assuming rho proportional to exp[Delta(J(ext))/k(B)T] and Delta(J(ext)) superconducting states induced by excess quasiparticles and discuss a mechanism of current-Induced suppression of the charge ordering in the title compound (C) 2009 Elsevier B V All rights reserved

    DOI: 10.1016/j.physb.2009.11.073

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  • Charge Order Competition Leading to Nonlinearity in Organic Thyristor Family Reviewed

    Yoshio Nogami, Noriaki Hanasaki, Masashi Watanabe, Kenichiro Yamamoto, Takayoshi Ito, Naoshi Ikeda, Hiroyuki Ohsumi, Hidenori Toyokawa, Yukio Noda, Ichiro Terasaki, Hatsumi Mori, Takehiko Mori

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 4 )   2010.4

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    Simultaneous synchrotron radiation and transport measurements for the organic thyristor family compound theta-(BEDT-TTF)(2)RbZn(SCN)(4) have revealed the presence of microscopic competing domains between the twofold and 3 x 4 charge orderings in a triangular lattice. In contrast to conventional correlated electron systems, charge ordering is a unique critical parameter of phase competition. With external current, only the twofold ordering melts, which is responsible for the emergence of a nonlinear response.

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  • Interplay of charge-density waves and superconductivity in the organic conductor beta ''-(BEDT-TTF)(2)AuBr2 Reviewed

    Ryusuke Kondo, Momoka Higa, Seiichi Kagoshima, Noriaki Hanasaki, Yoshio Nogami, Hiroyuki Nishikawa

    PHYSICAL REVIEW B   81 ( 2 )   2010.1

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    We studied the low-temperature electrical properties of the two-dimensional organic conductor beta ''-(BEDT-TTF)(2)AuBr2, whose electronic structure is similar to that of the pressure-induced superconductor beta ''-(DODHT)(2)PF6 having a charge-ordered transition at 255 K at ambient pressure. We found that the ground state of beta ''-(BEDT-TTF)(2)AuBr2 at ambient pressure has a charge-density-wave phase below 6.5 K accompanied by x-ray superlattice spots. We also discovered superconductivity in the vicinity of the charge-density-wave phase by applying uniaxial strain. Based on the obtained results, we propose a unified electronic phase diagram that suggests the relationships among the charge-ordered insulating state, the superconducting phase, and the charge-density-wave phase in beta ''-type organic conductors. The phase diagram shows that the superconducting phase is located near the charge-density-wave phase, which suggests that spin fluctuations play a minor role in the mechanism of the superconductivity and sheds light on the possibility of charge-fluctuation-mediated superconductivity in this type of organic conductor.

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  • Commensurate-incommensurate urate transition of charge density waves in o-TaS3 Reviewed

    K. Inagaki, M. Tsubota, K. Ichimura, S. Tanda, K. Yamamoto, N. Hanasaki, Y. Nogami, N. Ikeda, T. Ito, H. Toyokawa

    PHYSICA B-CONDENSED MATTER   404 ( 3-4 )   396 - 398   2009.3

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    We report a synchrotron X-ray study of charge density waves (CDWs) in an o-TaS3 crystal. CDW of o-TaS3 has been known to undergo a commensurate-incommensurate transition at 100 K, below which the wavevector locks in with the pristine lattice. However, the details of the commensurate-incommensurate transition remain open problems, the example being whether the discommensuration exists or not in the neighborhood of the transition. We exploited the beamline BL02B1 of SPring-8. A two-dimensional detector was placed at a distance of 1300mm from the sample, providing an angle resolution of 0.0076 degrees. Temperature dependence of the Bragg peak (0 0 2) and satellite peak (1 - 12) + q was measured from 7 to 180 K. We found that a new phase in the temperature range of 130-50 K, where two independent CDWs coexist. These waves are incommensurate and commensurate CDWs with longitudinal wave vectors q(c) = 0.252c* and 0.250c*, respectively. By lowering the temperature, intensity of the incommensurate CDW was decreased, while that of the commensurate CDW was increased. Below 50K, the incommensurate CDW was completely diminished. Based on the concept of discommensuration, we suggested the dislocation configuration from the intensity of the two CDWs. (C) 2008 Elsevier B.V. All rights reserved.

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  • Current-Density Dependence of the Charge-Ordering Gap in the Organic Salt theta-(BEDT-TTF)(2)CsM(SCN)(4) (M = Zn, Co, and Co0.7Zn0.3) Reviewed

    Fumiaki Sawano, Tomohiro Suko, Taichi S. Inada, Shuichi Tasaki, Ichiro Terasaki, Hatsumi Mori, Takehiko Mori, Yoshio Nogami, Naoshi Ikeda, Masashi Watanabe, Yukio Noda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   78 ( 2 )   2009.2

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    We have measured and analyzed the resistivity and voltage-current characteristics of the charge-ordered organic salt theta-(BEDT-TTF)(2)CsM(SCN)(4) (M = Zn, Co, and Co(0.7)Z(0.3)). At 4.3 K, all the samples show giant nonlinear conduction, in which the c-axis resistivity markedly decreases with external current by a factor of 10 against a small electric field of 1 V/cm. The temperature dependence of the resistivity is well described by an activation law, the activation energy of which is evaluated to be 2 meV in the low-current limit, and linearly decreases with external current. The activation energy and x-ray intensity near q(2) = (0, k, 1/2) are found to show the same dependence on current density. This coincidence strongly suggests that the energy gap of the charge order indexed by q(2) is an order parameter of this phenomenon.

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  • Synchrotron X-ray study of charge density waves in o-TaS3 Reviewed

    K. Inagaki, M. Tsubota, K. Ichimura, S. Tanda, K. Yamamoto, N. Hanasaki, Y. Nogami, N. Ikeda, T. Ito, H. Toyokawa

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4   150   2009

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    We report a synchrotron X-ray study of charge density waves (CDW) in an o-TaS3 crystal. CDW of o-TaS3 has been known to undergo a commensurate-incommensurate transition at 100 K, below which the wavevector locks in with the pristine lattice. We exploited the beamline BL02B1 of SPring-8. Temperature dependence of the Bragg peak (002) and satellite peak (1 -1 2)+(q) over right arrow was measured from 7 K to 180 K. We found that a new phase in a temperature range of 130-50 K, where two independent CDWs coexist. These waves are incommensurate and commensurate CDWs with longitudinal wave vectors q(c)=0.252c* and 0.250c*, respectively. By lowering the temperature, intensity of the incommensurate CDW was decreased, while that of the commensurate CDW was increased. At 50 K, the incommensurate CDW was completely diminished. Based on the concept of discommensuration, we determined the dislocation configuration from the intensity of the two CDWs.

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  • Temperature and electric-current dependence of charge-ordered domains in theta-(BEDT-TTF)(2)CsZn(SCN)(4) Reviewed

    T. Ito, M. Watanabe, K. -I. Yamamoto, N. Ikeda, Y. Nogami, Y. Noda, H. Mori, T. Mori, I. Terasaki

    EPL   84 ( 2 )   2008.10

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    We report X-ray diffraction measurements of the charge-ordered organic conductor theta-(BEDT-TTF)(2)CsZn(SCN)(4) at various temperatures with external currents. The two kinds of diffuse scattering observed at q(1) = (2/3 k 1/3) and q(2) = (0 k 1/2) exhibit remarkable difference in the interplane correlation along the b-axis, the temperature dependence, and the electric-current dependence. These observations suggest that the two diffuse scatterings come from spatially different charge-ordered domains. The external current melts the q(2)-type domains, which can control the competition of the two orders. Copyright (C) EPLA, 2008

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  • Field-induced discommensuration in charge density waves in o-TaS3 Reviewed

    Katsuhiko Inagaki, Masakatsu Tsubota, Kazuki Higashiyama, Koichi Ichimura, Satoshi Tanda, Kenichiro Yamamoto, Noriaki Hanasaki, Naoshi Ikeda, Yoshio Nogami, Takayoshi Ito, Hidenori Toyokawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 9 )   2008.9

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    We report a synchrotron X-ray Study of charge density waves (CDWs) in an o-TaS3 crystal. We found that two independent CDWs coexist ill the temperature range of 130-50K. These waves are incommensurate and commensurate CDWs with longitudinal wave vectors q(c) = 0.252c* and 0.250c*, respectively. The temperature and electric current dependences of the intensity of the two CDW satellites were measured. We found that the commensurate CDW was converted to the incommensurate CDW at 80 K by inducing current flow. Our observation was interpreted in terms of the dynamics of topological defects. We determined the edge dislocation configuration from the electric Current dependence of the intensity of the two CDWs. The result implies Cor the first time that discommensurations are induced ill the commensurate CDW by applying an electric field.

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  • Hump Like Resistance Anomaly in Organic Conductor β"-(BEDT-TTF)_2CsCd(SCN)_4

    KONDO Ryusuke, OTSUJI Jun, KAGOSHIMA Seiichi, NOGAMI Yoshio

    Journal of the Physical Society of Japan   77 ( 6 )   "63702 - 1"-"63702-4"   2008.6

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    We investigate the low-temperature electronic phase of a two-dimensional organic conductor, β&quot;-(BEDT-TTF)_2CsCd(SCN)_4 [where BEDT-TTF denotes bis(ethylenedithio)tetrathiafulvalene], which has a large hump between 32 and around 5K in the temperature dependence of the interlayer resistance. We present experimental results for the temperature dependence of the resistance under magnetic fields and its Kohler plots, and an x-ray diffraction study. We find that I) Kohler&#039;s rule is strongly violated below 32K, although the rule is valid above 32K, and II) weak superlattice spots appear at 15.6K in the x-ray study. On the basis of the experimental results, we suggest that the origin of the resistance hump is the formation of a possible charge density wave transition at about 32K by the nesting of a pair of large one-dimensional Fermi surfaces obtained in the electronic structure calculation based on the crystal structure at room temperature.

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  • Non-thermal evidence for current-induced melting of charge order in theta-(BEDT-TTF)(2)CsZn(SCN)(4) Reviewed

    Masashi Watanabe, Kenichiro Yamamoto, Takayoshi Ito, Yusaku Nakashima, Makoto Tanabe, Noriaki Hanasaki, Naoshi Ikeda, Yoshio Nogami, Hiroyuki Ohsumi, Hidenori Toyokawa, Yukio Noda, Ichiro Terasaki, Fumiaki Sawano, Tomohiro Suko, Hatsumi Mori, Takehiko Mori

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 6 )   2008.6

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    DOI: 10.1143/JPSJ.77.065004

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  • Hump like resistance anomaly in organic conductor beta ''-(BEDT-TTF)(2)CsCd(SCN)(4) Reviewed

    Ryusuke Kondo, Jun Otsuji, Seiichi Kagoshima, Yoshio Nogami

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 6 )   2008.6

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    We investigate the low-temperature electronic phase of a two-dimensional organic conductor, (BEDT-TTF)(2)CsCd(SCN)(4) [where BEDT-TTF denotes bis(ethylenedithio)tetrathiafulvalene], which has a large hump between 32 and around 5 K in the temperature dependence of the interlayer resistance. We present experimental results for the temperature dependence of the resistance under magnetic fields and its Kohler plots, and an x-ray diffraction study. We find that I) Kohler's rule is strongly violated below 32 K, although the rule is valid above 32 K, and II) weak superlattice spots appear at 15.6 K in the x-ray study. On the basis of the experimental results, we suggest that the origin of the resistance hump is the formation of a possible charge density wave transition at about 32 K by the nesting of a pair of large one-dimensional Fermi surfaces obtained in the electronic structure calculation based on the crystal structure at room temperature.

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  • Relaxation of geometrical frustration in NbSe3 topological crystals Reviewed

    Tsuneta Taku, Nogami Yoshio, Yamamoto Kenichirou, Ikeda Naoshi, Tanda Satoshi

    ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES   64   C509   2008

  • Spin-Peierls transition in the charge-ordered organic conductor theta-BEDT-TTF2RbZn(SCN)(4) Reviewed

    Masashi Watanabe, Yukio Noda, Yoshio Nogami, Hatsumi Mori

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 12 )   2007.12

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    X-ray investigation of theta-BEDT-TTF2RbZn(SCN)4 was carried out around the temperature of the phase transition to the nonmagnetic state. theta-BEDT-TTF2RbZn(SCN)4 exhibits a metal-insulator transition accompanied by a charge ordering at T-CO = 200 K. In the one-dimensional spin chain formed by this charge ordering, BEDT-TTF donor molecules are aligned uniformly along the a-axis obeying the 2(1) screw symmetry of the space group P2(1)2(1)2(1) below Tco. At the ground state, the system becomes nonmagnetic. The transition temperature T-c to the nonmagnetic phase seems to scatter around 20 K and may depend on the sample. We found that the extinction rule of [h00: It = 2n] no longer applied below approximately 20 K. This indicated a symmetry breaking of the 2(1) screw symmetry along the a-axis in the nonmagnetic state. The observed peak intensities violating the extinction rule were about 10(-4) of other general Bragg reflection. peak intensities. This structural change should be interpreted as a spin-Peierls transition in the charge-ordered system. In addition, a corresponding anomaly was observed in the lattice parameter a.

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  • Charge ordering in organic conductors Reviewed

    Toshihiro Takahashi, Yoshio Nogami, Kyuya Yakushi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 5 )   2006.5

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    Present status of experiments on charge ordering (CO) phenomena observed in organic molecular conductors is reviewed. Experimental techniques to detect and analyze the CO, i.e., NMR, X-ray and Infrared/Raman spectroscopy, are described and the experimental results in typical materials exhibiting CO are summarized. (DI-DCNQI)(2)Ag, (TMTTF)(2)X, alpha-(BEDT-TTF)(2)I-3, theta-(BEDT-TTF)(2)RbZn(SCN)(4) and related materials are discussed. Charge disproportionation without long-range order observed in numbers of materials are also included.

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  • Is the two dimensional organic Conductor, iota-(EDO-S,S-DMEDT-TTF)(2)(AuCl2)(1+y) clean or dirty? Reviewed

    T. Nakanishi, S. Yasuzuka, M. Teramura, L. Li, T. Fujimoto, T. Sasaki, T. Konoike, T. Terashima, S. Uji, Y. Nogami, G. C. Anyfantis, G. C. Papavassiliou, Keizo Murata

    JOURNAL OF LOW TEMPERATURE PHYSICS   142 ( 3-4 )   247 - 252   2006.2

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    The transport properties of organic tau-type conductors seem to be very clean as well as very dirty depending on what we observe. To clarify this problem, we studied temperature and magnetic field dependence of resistivity, rho(T, B), in tau-(EDO-S,S-DMEDT-TTF)(2)(AuCl2)(1+y). The properties that favor "probably dirty" are: i) stepwise rho(a)(T) increase below 20 K, which is suppressed by magnetic field, and ii) contrasted difference in rho(T) as well as magnetization M(T) between field cooled (FC) and zero field cooled (ZFC). On the other hand, Shubnikov de Haas oscillations with very low Dingle temperature (T-D = 1.5 K) are typical of clean system. Based on these observations, we conclude this system changes from "dirty" to "clean" system by increase of magnetic field.

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  • クリスタリット

    坂田 修身, 乾 雅祝, 大高 理, 木原 國昭, 大嶋 建一, 石沢 伸夫, 八島 正知, 川路 均, 道上 勇一, 野上 由夫, 福永 俊晴

    日本結晶学会誌   48 ( 1 )   92 - 96   2006

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  • X-ray and neutron transparent pulse magnets Reviewed

    E. Ohmichi, N. Ikeda, Y. Nogami, T. Osada

    YAMADA CONFERENCE LX ON RESEARCH IN HIGH MAGNETIC FIELDS   51   498 - +   2006

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    A new type of pulse magnet, x-ray and neutron transparent pulse magnet, is suggested for use in high-field diffraction experiments. The magnet is made of aluminum-based material, so we expect that the scattered beam penetrates the magnet body and hence the total number of reflection points available substantially increases. This feature possibly allows full determination of the lattice and magnetic structure in strong magnetic fields. To realize this idea, we constructed a prototype transparent magnet consisting of aluminum wire and duralumin reinforcement. With a portable capacitor bank, the maximum field of 25 T was successfully generated in a 1.6 mm bore, even though the aluminum wire is less strong and less conducting than copper wire. Since the total energy is small (E-bank similar to 100 J), high repetition rate, which is necessary for sufficient signal-to-noise ratio, is realized. Technical details, coil performance, and future prospects will be described.

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  • X-ray structural study of charge and anion orderings of TMTTF salts Reviewed

    Y Nogami, T Ito, K Yamamoto, N Irie, S Horita, T Kambe, N Nagao, K Oshima, N Ikeda, T Nakamura

    JOURNAL DE PHYSIQUE IV   131   39 - 42   2005.12

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    High resolution X-ray structure analyses and electronic structure calculation revealed the condition for the charge ordering(CO) observed in the (TMTTF)(2)X (Fabre) salts. The phase diagram of the electronic states including 2k(F) and 4k(F) CO has been proposed associated with magnitudes Of Molecular dimerization and tetramerization.

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  • Evidence of band-filling control of tau-type organic conductors by thermal treatment Reviewed

    H Yoshino, T Nakanishi, L Li, K Murata, D Graf, ES Choi, JS Brooks, Y Nogami, GC Papavassiliou

    SYNTHETIC METALS   153 ( 1-3 )   453 - 456   2005.9

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    The two dimensional (2D) organic conductor tau-(EDO-S,S-DMEDT-TTF)(2)(AuBr2)(1+y), (y &lt;= 0.875) is known to exhibit sample dependence of the electric resistivity. The present authors assumed that the possible difference in y is responsible for the sample dependence and the amount of y can be effectively controlled for each crystal by thermal treatment. If it is the case,the band filling of the present compound can be also controlled. To observe the change in the band filling directly, the magnetoresistance was measured up to 45 T at 0.5 K for the magnetic field perpendicular to the conducting ab plane of the samples from one single crystal, one of which had been heated up to 400 K. Both the samples showed the two series of Shubnikov-de Haas oscillations of the magnetoresistance as reported previously. We, however, found the remarkable difference in the frequency of the slower oscillations between the virgin and heated samples. The X-ray study revealed that the thermal treatment does not affect the crystal structure related to the 2D band structure. Thus the frequency change by the thermal treatment is caused by the change in the band filling and it is tuned by heating the crystal.

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  • An organic thyristor Reviewed

    F Sawano, Terasaki, I, H Mori, T Mori, M Watanabe, N Ikeda, Y Nogami, Y Noda

    NATURE   437 ( 7058 )   522 - 524   2005.9

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    Thyristors are a class of nonlinear electronic device that exhibit bistable resistance - that is, they can be switched between two different conductance states(1). Thyristors are widely used as inverters ( direct to alternating current converters) and for the smooth control of power in a variety of applications such as motors and refrigerators. Materials and structures that exhibit nonlinear resistance of this sort are not only useful for practical applications: they also provide systems for exploring fundamental aspects of solid- state and statistical physics. Here we report the discovery of a giant nonlinear resistance effect in the conducting organic salt(2) theta- ( BEDT- TTF) 2CsCo( SCN)(4), the voltage- current characteristics of which are essentially the same as those of a conventional thyristor. This intrinsic organic thyristor works as an inverter, generating an alternating current when a static direct- current voltage is applied. Whereas conventional thyristors consist of a series of diodes ( their nonlinearity comes from interface effects at the p- n junctions), the present salt exhibits giant nonlinear resistance as a bulk phenomenon. We attribute the origin of this effect to the current-induced melting of insulating charge- order domains, an intrinsically non- equilibrium phenomenon in the sense that ordered domains are melted by a steady flow.

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  • Determination of band-filling change in the two-dimensional organic conductor, tau-(EDO-S,S-DMEDT-TTF)(2)(AuBr2)(1+y), (y &lt;= 0.875) by the quantum oscillation of magnetoresistance

    H Yoshino, K Murata, T Nakanishi, L Li, ES Choi, D Graf, JS Brooks, Y Nogami, GC Papavassiliou

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 1 )   417 - 424   2005.1

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    The effect of thermal treatment on the transport properties is studied for a two-dimensional organic conductor tau-(EDO-S,S-DMEDT-TTF)(2)(AuBr2)(1+y), (y less than or equal to 0.875). The temperature dependence of the electric resistivity below room temperature was found to be changed from metallic down to low temperature to semiconducting by heating up to 420K. One of the two frequencies of Shubnikovde Haas oscillations are found to be different between the non-heated and heated parts from a single crystal, while no evidence of structural change in X-ray photograph was observed. The present result clearly shows that nominal valence or band filling can be controlled by simple thermal treatment for the quasi-two-dimensional organic metal. The mechanism of the change in the band filling is discussed in terms of anion decomposition.

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  • Determination of band-filling change in the two-dimensional organic conductor, tau-(EDO-S,S-DMEDT-TTF)(2)(AuBr2)(1+y), (y &lt;= 0.875) by the quantum oscillation of magnetoresistance Reviewed

    H Yoshino, K Murata, T Nakanishi, L Li, ES Choi, D Graf, JS Brooks, Y Nogami, GC Papavassiliou

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 1 )   417 - 424   2005.1

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    The effect of thermal treatment on the transport properties is studied for a two-dimensional organic conductor tau-(EDO-S,S-DMEDT-TTF)(2)(AuBr2)(1+y), (y less than or equal to 0.875). The temperature dependence of the electric resistivity below room temperature was found to be changed from metallic down to low temperature to semiconducting by heating up to 420K. One of the two frequencies of Shubnikovde Haas oscillations are found to be different between the non-heated and heated parts from a single crystal, while no evidence of structural change in X-ray photograph was observed. The present result clearly shows that nominal valence or band filling can be controlled by simple thermal treatment for the quasi-two-dimensional organic metal. The mechanism of the change in the band filling is discussed in terms of anion decomposition.

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  • Structural phase transition in two-dimensional kagome antiferromagnet m-N-methylpyridinium alpha-nitronyl nitroxide center dot BF4 center dot 1/3(Acetone) Reviewed

    T Kambe, Y Nogami, K Oshima, W Fujita, K Awaga

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 4 )   796 - 799   2004.4

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    We found for the first time a structural phase transition in two-dimensional kagome antiferromagnet m-N-methylpyridinium alpha-nitronyl nitroxide (m-MPYNN)(.)BF(4)(.)1/3 (acetone). As, below T-s = 128.7 K, the intense satellite reflections are clearly observed at the modulation wave vector of q(s) = (1/3, 1/3, 0), the unit cell of the low-temperature phase is enlarged to root3a x root3a x c. In the low-temperature phase, the space group is determined to be P31c. The orientation of acetone molecules orders below T-s, leading to the lack of the three-fold axis. To confirm whether the low-temperature phase maintains a kagome-like network structure or not, we estimate the overlap integrals between the singly occupied molecular orbital wave functions of the MPYNN molecules by the extended Huckel method. The result is that all the overlap integrals are modified below T-s, suggesting that the system below T-s cannot be regarded as the uniform S = 1 kagome antiferromagnet.

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  • Structural phase transition of theta-(BEDT-TTF)(2)RbZn(SCN)(4) under high pressure Reviewed

    M Watanabe, Y Noda, Y Nogami, H Mori

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 4 )   921 - 925   2004.4

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    theta-(BEDT-TTF)(2)RbZn(SCN)(4) is known as a two-dimensional organic conductor exhibiting a metal-insulator phase transition associated with a charge ordering phenomena at T-MI = 200 K under ambient pressure. The transition temperature increases with applied pressure and reaches room temperature at 1.1 GPa. The structural change by pressure induced phase transition was investigated by X-ray diffraction using synchrotron radiation. A superlattice formation of 2c was found above 1.1 GPa. A single crystal structural analysis taking account of the superlattice was carried out at 1.2 GPa. Displacements of BEDT-TTF molecules were found to be similar to the displacements in the low temperature phase at the ambient pressure. However, the shrinkage of the c-axis under pressure was four times as large as that under cooling at the transition point. Decreases in the intermolecular distances between BEDT-TTF molecules resulted in increases of the intersite Coulomb energies V and an increase of the electric bandwidth W. U/W (U: on-site Coulomb energy) decreased as a result of an increase of W. Such a change of U/W is obstructive to the enhancement of the charge ordered phase. This indicates that an effect of V is indispensable to the charge-ordered phase in this material.

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  • Transfer integrals and the spatial pattern of charge ordering in theta-(BEDT-TTF)(2)RbZn(SCN)(4) at 90 K Reviewed

    M Watanabe, Y Noda, Y Nogami, H Mori

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 1 )   116 - 122   2004.1

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    theta-(BEDT-TTF)(2)RbZn(SCN)(4) is a two-dimensional organic conductor exhibiting a metal-insulator transition at T-MI = 200 K. This insulating charge ordered state below T-MI was investigated by a single crystal structural analysis taking account of the superlattice formation below T-MI. A large displacement (about 0.2 Angstrom) of BEDT-TTF molecules associated with the transition was found. Transfer integrals between BEDT-TTF molecules were also calculated from the structural data. The two-dimensional net of transfer integrals above T-MI was modulated into the quasi one-dimensional transfer integral chain by the superlattice formation below T-MI. The ionicities of BEDT-TTF molecules are estimated from the intramolecular bond length distribution. As a result, charge disproportionation between BEDT-TTF molecules was found, and the ionicity was 0 to +0.2 and +0.8 to +1.0 respectively. The hole-rich sites are laid on the quasi one-dimensional transfer integral chain. We conclude that the spatial pattern of charge ordering is a stripe alternating along the c-axis.

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  • X-ray study of modulated structures of beta '-CuxV2O5 (x=0.29,0.39) Reviewed

    N Nagao, Y Nogami, K Oshima, H Yamada, Y Ueda

    PHYSICA B-CONDENSED MATTER   329   713 - 714   2003.5

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    High resolution X-ray study reveals the wave vector change in the modulated structure of the quasi-one-dimensional compound beta'-Cu vanadium bronze. Structural modulation of the reduced wave vector q(0) = (0, 0.305, 0) emerges below 220 K in beta'-Cu0.29V2O5. For beta'-Cu0.39V2O5, not the single q modulation but two kinds of modulations were observed. A three-fold superlattice structure with q(1) = (0, 0.333, 0) appears below 210 K. An incommensurate modulated structure with q(2) = (0, 0.26-0.29, 0) coexists below 175 K, whose satellite intensity and b* component Q(b) have temperature and passing-time dependencies between 140 and 175 K. The competition between q(1) and q(2) modulations was also observed. It seems that the q(2) is deeply related to the physical property change between 140 and 180 K confirmed by the decrease in the magnetic susceptibility and the increase in the resistivity. (C) 2003 Elsevier Science B.V. All rights reserved.

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  • High field Fermi surfaces studied by AMRO in eta-Mo4O11 Reviewed

    K Oshima, T Kambe, Y Nogami, T Sasaki

    PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES   18 ( 1-3 )   198 - 199   2003.5

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    The high field Fermi surface in eta-Mo4O11 at low temperatures has been studied by the Angle-dependent Magnetoresistance Oscillation (AMMO) method (Organic Super Conductors, Springer, Berlin, 1998, p. 455). The Shubnikov-de Haas (SdH) oscillation so far obtained shows existence of the several closed surfaces, but the results only give the area of the pockets. The AMMO result at high fields in the plane perpendicular to the crystal b-axis shows the angle-dependent resistance oscillation together with the SdH oscillations. We see no clear AMMO for the fields in the plane perpendicular to the c-axis. The results indicate the existence of very anisotropic Fermi surfaces, which are expected from the Fermi surface model (Chem. Rev. 91 (1991) 965) taking into account the lower temperature CDW nesting vector q(2). (C) 2002 Elsevier Science B.V. All rights reserved.

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  • Effects of tungsten doping on the CDW states of eta-Mo4O11 Reviewed

    T Kambe, S Tsuboi, N Nagao, Y Nogami, K Oshima

    PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES   18 ( 1-3 )   196 - 197   2003.5

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    The eta-Mo4O11 system shows successive CDW transitions due to its two-dimensional Fermi surface instability. We find that the lower temperature CDW-II transition easily disappears by doping a small amount of W atoms (less than 0.2%/Mo), though the higher temperature CDW-I transition is weakly depressed. The W atoms possibly substitute both the intra- and the inter-layer Mo sites. The doping effectively reduce the carrier compensation, leading to the suppression of TCDW-I. Moreover, the interlayer coherence between the intralayer two-dimensional CDWs may be destroyed by the substitution between the layers since the modulation of CDW-II state has an interlayer component. The resistivity along the conducting plane follows "log T" dependence below 10 K, suggesting that the W atoms doped within the layer should induce the Anderson-type charge localization. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S1386-9477(02)00963-3

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  • Shubnikov-de Haas oscillations and Fermi surface of tau-phase conductors Reviewed

    T Konoike, K Iwashita, Nakano, I, H Yoshino, T Sasaki, Y Nogami, JS Brooks, D Graf, CH Mielke, GC Papavassiliou, K Murata

    PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES   18 ( 1-3 )   188 - 189   2003.5

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    tau-phase organic quasi-two-dimensional conductors have a 4-fold single Fermi surface (FS) from band calculation. At low temperature, the resistivity turns into semiconducting, whereas Shubnikov-de Haas oscillations (SdH) have been observed. The SdH signal includes two frequencies that are inconsistent with the band calculation. Recently, we found the superstructure of this salt below 245 K by X-ray study. This result may explain the contradiction between observation and calculation for the FS. (C) 2003 Elsevier Science B.V. All rights reserved.

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  • X-ray study of modulated structures of beta '-CuxV2O5 (x=0.29,0.39)

    N Nagao, Y Nogami, K Oshima, H Yamada, Y Ueda

    PHYSICA B-CONDENSED MATTER   329 ( 329 )   713 - 714   2003.5

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    High resolution X-ray study reveals the wave vector change in the modulated structure of the quasi-one-dimensional compound beta'-Cu vanadium bronze. Structural modulation of the reduced wave vector q(0) = (0, 0.305, 0) emerges below 220 K in beta'-Cu0.29V2O5. For beta'-Cu0.39V2O5, not the single q modulation but two kinds of modulations were observed. A three-fold superlattice structure with q(1) = (0, 0.333, 0) appears below 210 K. An incommensurate modulated structure with q(2) = (0, 0.26-0.29, 0) coexists below 175 K, whose satellite intensity and b* component Q(b) have temperature and passing-time dependencies between 140 and 175 K. The competition between q(1) and q(2) modulations was also observed. It seems that the q(2) is deeply related to the physical property change between 140 and 180 K confirmed by the decrease in the magnetic susceptibility and the increase in the resistivity. (C) 2003 Elsevier Science B.V. All rights reserved.

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  • Shubnikov-de Haas oscillations and low temperature electronic structure in tau-phase conductors Reviewed

    T Konoike, K Iwashita, Nakano, I, H Yoshino, T Sasaki, T Takahashi, Y Nogami, JS Brooks, D Graf, CH Mielke, GC Papavassiliou, K Murata

    SYNTHETIC METALS   135 ( 1-3 )   615 - 616   2003.4

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    tau-phase organic quasi-two-dimensional conductors have a 4-fold single Fermi surface (FS) from band calculation. At low temperature, the resistivity turns into semiconducting, whereas Shubnikov-de Haas oscillations have been observed. The amplitude of the oscillation is quite large because the system is near the quantum limit (N=2-state) under -27 T. The observed oscillations include two frequencies that are inconsistent with the band calculation. The reason of this discrepancy may be explained by the reconstruction of the FS. In this work, we examined very high magnetic field transport property up to 60 T and reconsider the low temperature crystal structure of this salt by diffuse X-ray study.

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  • Superlattice structural analysis of (TTM-TTP)I-3 at low temperatures Reviewed

    Y Nogami, T Kambe, N Fujimura, K Oshima, T Mori, T Kawamoto

    SYNTHETIC METALS   135 ( 1-3 )   637 - 638   2003.4

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    The title quasi one-dimensional conductor with a half-filled energy band shows two kinds of modulated structures q(1) of (0 0 0.5) below 160 K and q(2) of (0.5 0 0.5) below 100 K. These wave vectors can nest Q1D Fermi surface. Two kinds of superlattice structures were solved using X-ray. In both cases, enhanced displacements of I-3 ions were observed. Their possible origins and their effects on the physical properties were discussed.

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  • Investigation of X-ray diffuse scattering in theta-(BEDT-TTF)(2)RbM '(SCN)(4) Reviewed

    M Watanabe, Y Noda, Y Nogami, H Mori

    SYNTHETIC METALS   135 ( 1-3 )   665 - 666   2003.4

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    The modulated structure of theta-(BEDT-TTF)(2)RbM'(SCN)(4); (M'=Zn, Co) were investigated by X-ray diffraction method. theta-(BEDTTTF)(2)RbM'(SCN)(4) are two-dimensional organic conductors which exhibit metal-insulator transition at 210 K. The insulating phase is known as a charge ordered state. Above T-MI = 210 K, diffuse rod of q=(1/3 k 1/4) was found. Below T-MI, there are some differences depending on the sample cooling speed. In the slow-cooled-state (0.2 K/min), the diffuse rod of q=(1/3 k 1/4) disappears and is replaced by superlattice of c*/2. In the rapid-cooled-state (5-6 K/min), the structural phase transition at T-MI becomes imperfect. The diffuse rod of q remains below T-MI and the lattice modulation of c*/2 is disordered in the direction of inter-conducting-layer.

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  • Fermi surface and low temperature structure in (DMET-TSeF)(2)Au(CN)(2) Reviewed

    K Kato, K Oshima, T Kambe, Y Nogami, T Sasaki, M Motokawa, R Kato

    SYNTHETIC METALS   135 ( 1-3 )   577 - 578   2003.4

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    The title compound is one of the DMET-TSeF salts which are quasi-one-dimensional organic metals at room temperatures. We show that the compound has a closed Fermi surface using the angle-dependent magnetoresistance oscillation (AMRO) method together with magnetoresistance and magnetization quantum oscillation measurements at low temperatures. By the X-ray measurement, we confirm that the structural phase transition observed around 180 K is related to the anomaly observed in the temperature dependence of the resistivity [1]. The nesting vector has the direction of 0.5a*+0.5c*. The obtained low temperature closed Fermi surface has about 4 % of the first Brillouin zone area. The AMRO data show the existence of a very anisotropic Fermi surface where the diameter perpendicular to the most conducting a direction is about 0.5 c*. The possible origin of the low temperature closed Fermi surface is discussed and the relation to the ordering of anion molecules is considered as the probable reason.

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  • Magnetic investigation of itinerant and local hybrid spins system, (CHTM-TTP)(2)TCNQ Reviewed

    T Nakamura, M Taniguchi, Y Misaki, K Tanaka, Y Nogami

    SYNTHETIC METALS   133   441 - 442   2003.3

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    EPR measurements of a new two-component organic conductor, (CHTM-TTP)(2)TCNQ, were performed. This salt shows two drastic successive phase transitions at low temperatures. The electronic phases of the title salt are discussed by microscopic point of view. The contributions of the two-spin species of the magnetic properties are separated. Possibility of cooperative phenomena in the two-spin system with itinerant and localised moments is discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

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  • Magnetic properties of TDAE-C-70-toluene Reviewed

    K Oshima, T Kambe, M Fujiwara, Y Nogami

    SYNTHETIC METALS   133   699 - 701   2003.3

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    The magnetic properties of single crystal TDAE-C-70-toluene are reported in relation to its unique dimerized structure Of C-70 molecules in the unit cell. The g-factor at room temperature (g = 2.0052) suggests that the origin of the magnetism is different from C-70 (g = 2.002). The spins on the C-70 molecules are cancelled out due to the dimerization. No magnetic phase transition appears at least down to 0.5 K. The magnetic susceptibility follows the Curie-Weiss law with the Weiss constant of +0.36 K. These results show that the weakly coupled spins on TDAE molecules contribute the magnetism of this salt, which is in contrast to the ferromagnetic TDAE-C-60 where the TDAE spins are cancelled. (C) 2002 Elsevier Science B.V. All rights reserved.

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  • Structural phase transition in theta-(BEDT-TTF)(2)RbM '(SCN)(4) (M ' = Zn, Co) Reviewed

    M Watanabe, Y Noda, Y Nogami, H Mori, S Tanaka

    SYNTHETIC METALS   133   283 - 285   2003.3

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    Spatial pattern of charge ordering in two-dimensional compound theta-(BEDT-TTF)(2)RbM'(SCN)(4) (M' = Zn, Co) was revealed using single crystal X-ray structural analysis below the metal-insulator transition temperature T-c of around 190 K. Molecular ionicity was evaluated by the intramolecular bond length. The ordering pattern of charge disproportion among ET molecules was stripe ordered alternating c-axis (horizontal stripe). (C) 2002 Elsevier Science B.V. All rights reserved.

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  • The charge ordered state and the possible 2k(F)-CDW state with Fermi surface nesting in organic conductor 0-(BEDT-TTF)(2)MM'(SCN)(4) (MM '= RbZn, CsCo) Reviewed

    M Watanabe, Y Noda, Y Nogami, K Oshima, H Mori

    JOURNAL DE PHYSIQUE IV   12 ( PR9 )   231 - 232   2002.11

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    Two-dmensional organic conductor theta-(BEDT-TTF)(2)RbZn(SCN)(4) and theta-(BEDT-TTF)(2)CsCo(SCN)(4) were investigated by X-ray diffraction measurements. Both salts exhibit an isostructural crystal structure at room temperature (RT). However, the RbZn salt undergoes a metal-insulator transition associated with superlattice formation of 2c. The charge ordered state below T-Ml, was observed by crystal structure analysis taking into account of the superlattice. This modulation of 2c has no relation to the topology of the calculated Fermi surface nesting vector at all. Below T-Ml, the systematic deformations of BEDT-TTF molecular shape indicated charge disproportionation between BEDT-TTFs possibly caused by the electron correlation effect. On the other hand, in the CsCo salt, another incommensurate lattice modulation was found under high pressure of 1GPa. This incommensurate modulation vector of (2/3 0 0.29) is in agreement with the nesting vector of Fermi surface under high pressure. In this system, it seems that small change caused by chemical substitution can vary the electronic state from the charge ordered state to the CDW state.

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  • Unusual 2k(F) CDW state with enhanced charge ordering in beta-(BEDT-TTF)(2)AsF6 and PF6 Reviewed

    Y Nogami, T Mori

    JOURNAL DE PHYSIQUE IV   12 ( PR9 )   233 - 234   2002.11

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    X-ray superstructure analyses of the 2k(F) CDW states for two-dimensional organic compounds beta-(BEDT-TTF)(2)PF6 and AsF6 were presented Molecular ionicity of BEDT-TFF was evaluated with both intramolecular bond lengths and molecular shape. Strong bending of quasi-neutral BEDT-TTF molecules coupled with the enhanced amplitude of charge modulation was observed Conformational ordering of the terminal ethylenes of BEDT-TTF molecules and dimerization between quasi-ionic BEDT-TTF molecules were also observed These characteristic indicates this CDW is not Peierls-Frohlich type but coupled with the internal degree of the molecular shape and possibly the intersite Coulomb repulsion.

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  • X-ray observation of 2k(F) and 4k(F) charge orderings in (TMTTF)(2)ReO4 and (TMTTF)(2)SCN associated with anion orderings Reviewed

    Y Nogami, T Nakamura

    JOURNAL DE PHYSIQUE IV   12 ( PR9 )   145 - 148   2002.11

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    Electronic transfer integrals (t) and TMTTF molecular ionicities (rho) in several Fabre salts were estimated using the atomic coordinates obtained by systematic X-ray structure analyses at room and low temperatures. Among these Fabre salts containing the octahedral anions, (TMTTF)(2)PF6 has the largest degree of 4k(F) bond dimerization in t, (TMTTF)(2)AsF6 does the middle and (TMTTF)(2)SbF6 has the smallest. This tendency corresponds well to the degree of 2k(F) spin-Peierls instability at low temperatures which had been estimated. However opposite tendency was observed between the magnitude of the 4kF bond dimerization and the reported critical temperature of the charge disproportionation. The charge modulation patterns and the transfer integral modulation patterns of two salts containing non centrosymmetric anions, (TMTTF)(2)ReO4 and (TMTTF)(2)SCN were compared.

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  • Microscopic investigation of a new two-component organic conductor with itinerant and localized spins: (CHTM-TTP)(2)TCNQ Reviewed

    T Nakamura, M Taniguchi, Y Misaki, K Tanaka, Y Nogami

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( 9 )   2208 - 2215   2002.9

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    Low-temperature electronic phases in a new two-component organic conductor, a segregated-stack charge-transfer salt called (CHTM-TTP)(2)TCNQ, are investigated. The ESR g tensor analyses indicate that there exist itinerant CHTM-TTP spins and localized TCNQ spins at R.T. The temperature dependence of the physical parameters reveals that this salt undergoes two drastic, successive phase transitions at low temperatures. The effective moment of the localized TCNQ spins decreases at the 245 K transition and completely disappears at the transition around 195 K. These curious physical properties are explained by the drastic changes in the electronic states of the two different types of spins. The spin susceptibility was decomposed into the contribution of each of the two spin species by using ESR, H-1-NMR, and static susceptibility analyses. We present a microscopic investigation of the two-spin system with itinerant and localized moments.

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  • ESR investigation of organic conductor with itinerant and local spins, (CHTM-TTP)(2)TCNQ Reviewed

    T Nakamura, M Taniguchi, Y Misaki, K Tanaka, Y Nogami

    EPR IN THE 21ST CENTURY: BASICS AND APPLICATIONS TO MATERIAL, LIFE AND EARTH SCIENCES   192 - 196   2002

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    ESR investigation was carried out for the organic conductor with itinerant and local spins, (CHTM-TTP)(2)TCNQ. This salt shows two drastic successive phase transitions at low temperatures. The contributions of the two spin species of the magnetic properties are separated using with the g-tensor analyses. The electronic phases of the title salt are discussed by microscopic point of view.

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  • Low temperature X-ray and ESR study of Quasi-1D DMTCA-BF4 (C = S, Se) with half-filled band Reviewed

    T Kambe, N Fujimura, Y Nogami, K Oshima, K Yakushi, J Dong, K Takimiya, T Otsubo

    SYNTHETIC METALS   120 ( 1-3 )   931 - 932   2001.3

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    DMTCA-BF4 (C = S, Se) have been considered as a quasi-one-dimensional half-filled system. For both salts, the structural two-fold modulation along the stacking direction was observed from room temperature. We also found a rapid decrease in spin susceptibility of DMTSA-BF4 below 100 K, but no anomaly at the metal-insulator transition temperature (150 K).

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  • Two incommensurate CDWs in low-dimensional conductor eta-Mo4O11 Reviewed

    Y Nogami, T Kambe, N Nagao, K Oshima

    SYNTHETIC METALS   120 ( 1-3 )   1049 - 1050   2001.3

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    Using X-ray camera and diffractometer, structural evidence of the second CDW transition for the quasi two-dimensional conductor eta -Mo4O11 was presented. CDW critical wave vectors have been determined with high precision. Extremely weak satellite reflections at the reduced wave vector q(2)=(0.552 0.47 0.30) emerge below 25 K. Satellite reflections at the reduced wave vector q(1) = (0 0.232 0) was observed below 105 K.

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  • The structural and magnetic properties in TDAE-fullerene system Reviewed

    K Oshima, Y Nogami, T Kambe, N Nagao, M Fujiwara

    NANONETWORK MATERIALS: FULLERENES, NANOTUBES AND RELATED SYSTEMS   590   393 - 396   2001

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    The structural and magnetic properties are discussed on the TDAE-fullerene system for C-60 and C-70. The single crystal structural analysis reveals that the TDAE-C-70 system contains solvent molecules (toluene), and the C-70 molecules in the unit cell axe dimerized. The room temperature structure is monoclinic P2(1)/n, and crystal parameters are a=18.82(3)Angstrom, b=16.38(2)Angstrom, c=18.73(3)Angstrom and beta = 117.58(5)degrees. The same annealing procedure used in TDAE-C-60 does not alter the magnetic behavior in TDAE-C-70. A preliminary report is given for the TDAE-C-60 structural study in magnetic fields up to 7 T. The possible method that directly reveals the relation between magnetism and the molecular arrangement is proposed.

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  • Annealing effects on the magnetic and structural properties of single-crystal TDAE-C-60 Reviewed

    T Kambe, Y Nogami, K Oshima

    PHYSICAL REVIEW B   61 ( 2 )   R862 - R865   2000.1

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    Annealing effects on the magnetic and structural properties of single-crystal TDAE-C-60 are investigated. When a crystal is well-annealed at 350 K, ferromagnetic ordering takes place below 16 K, though no magnetic phase transition is shown in as-grown crystal. The saturated magnetization was obtained to be 0.9+/-0.1 mu(B) per C-60. It was first found that the well-annealed crystal shows a structural phase transition around 180 K, probably associated with the orientational ordering of C-60 molecules. On the other hand, the as-grown crystal undergoes no structural phase transition at least down to 30 K while the motion of C-60 molecules is restricted below around 150 K. The possible relation between the low-temperature structure and the magnetic ordering is discussed.

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  • X-ray structural study of 4k(F) Wigner crystal and 4k(F) Peierls state in DCNQI complex with 1/4 filled quasi one-dimensional band Reviewed

    Y Nogami, K Oshima, K Hiraki, K Kanoda

    JOURNAL DE PHYSIQUE IV   9 ( P10 )   357 - 359   1999.12

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    Using newly developed X-ray low temperature came-a 4k(F) periodic modulation was observed in organic quasi one-dimensional(Q1D) compounds (DMe-DCNQI)(2)Ag(abbreviated as DMe) and(DI-DCNQI)(2)Ag (abbreviated as DI). From 4k(F) satellite reflection intensity distribution in q-space, periodic molecular displacement in DMe and periodic molecular deformation possibly related with molecular valence ordering in DI were found. These modulation patterns suggest occurrence of 4k(F) bond CDW in DM and 4k(F) site CDW in DI. The 4k(F) site CDW possibly caused by a marked intersite correlation V,can be interpreted as a Wigner crystal.

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  • Novel pressure-induced 2k(F) CDW state in organic low-dimensional compound theta-(BEDT-TTF)(2)CsCo(SCN)(4) Reviewed

    M Watanabe, Y Nogami, K Oshima, H Mori, S Tanaka

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   68 ( 8 )   2654 - 2663   1999.8

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    A band structure calculation based on the X-ray structure analysis reveals that pressure raises quasi one-dimensionality of the Fermi surface of the title compound. A 2k(F) lattice modulation is observed with a wave vector q(3)' = (2/3 0 0.29) at 10.7 kbar and room temperature. This is the first observation of pressure-induced CDW. With cooling, the wave vector of the modulation changes from q(3)' to commensurate q(3) = (2/3 0 1/3) below 240 K. On the other hand, at ambient pressure and 20 K where the resistivity begins to increase rapidly, three-dimensional short range ordering occurs for the weak diffuse spot with a wave vector q(2) = (0 0 1/2), This modulation is ascribable to an occurrence of charge ordering possibly caused by the nearest neighbor Coulomb interaction V. A schematic phase diagram for the electronic state is presented.

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  • Annealing effects on organic ferromagnet C-60-TDAE Reviewed

    T Kambe, H Negawa, Y Nogami, K Oshima

    SYNTHETIC METALS   103 ( 1-3 )   2424 - 2424   1999.6

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    The annealing effects on the magnetic and structural properties for organic ferromagnet C-60 - TDAE are reported. The ESR line-width for unannealed single crystal shows a large hysteresis behavior around 130K. For the well-annealed crystal, on the other hand, the linewidth continuously changed with temperature. In addition, the room temperature structural analysis of the single crystal indicated that all the crystal axes, especially c-axis, shrunk after annealing.

    DOI: 10.1016/S0379-6779(98)00702-4

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  • Soliton dynamics in TTF-CA Reviewed

    T Kambe, Y Nogami, K Oshima, Y Takashi, H Sakai, S Koshihara

    SYNTHETIC METALS   103 ( 1-3 )   1824 - 1824   1999.6

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    Electron Spin-Echo (ESE) measurements on mixed-stack charge transfer compound tetrathiafulvalene (TTP)-chloranil (CA) are reported. Below Neutral-Ionic transition temperature, the ESE signals related to the spin solitons were observed. Comparing the phase memory time with the inverse of the EPR line-width, it was found that a crossover from fast motion of the spin solitons to slow motion took place around 70K. In addition ,the spin relaxation measurements suggested the thermal fluctuation of the dimerized lattice above 60K.

    DOI: 10.1016/S0379-6779(98)00472-X

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  • Low Temperature X-Ray and ESR study of one-dimensional compound (TTM-TTP)I-3 Reviewed

    N Fujimura, A Namba, T Kambe, Y Nogami, K Oshima, T Mori, T Kawamoto, Y Misaki, T Yamabe

    SYNTHETIC METALS   103 ( 1-3 )   2111 - 2112   1999.6

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    (TTM-TTP)I-3 which has been considered as the typical one-dimensional half-filled band system, has been critically restudied by structural and magnetic measurements. X-ray diffuse scattering study reveals the formation of 2k(F) CDW superstructure with the wave vector q(1) =(0, 0, 0.5) below 160 K of the metal-insulator transition temperature. Another structural modulation with q(2) = (0.5, 0, 0.5) is observed below 90-100 K. modulated structure analysis using the q(2) satellite reflections and the Bragg reflections shows the large displacement in I-3 anion. Anomalies in chi line width and g-value of ESR measurements which correspond to the structural anomaly, are also reported.

    DOI: 10.1016/S0379-6779(98)00473-1

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  • Low temperature superstructure and transfer integrals in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]X : X = Cl, Br Reviewed

    M Watanabe, Y Nogami, K Oshima, H Ito, T Ishiguro, G Saito

    SYNTHETIC METALS   103 ( 1-3 )   1909 - 1910   1999.6

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    Low temperature crystal structures and band parameters were presented for the deuterized (d) and the hydrogenized (h) kappa - (BEDT-TTF)2Cu[N(CN)2]Cl and for deuterized kappa-(BEDT-TTF)2Cu[N(CN)2]Br. An enhanced molecular dimerization was observed for the Cl salts. Theoretical prediction by H. Kino and H. Fukuyama that the molecular dimerization stabilizes the Mott insulating state was confirmed. Below 200 K, X-ray diffuse scattering study revealed formation of two dimensional ax2c superstructure in the deuterized kappa -(BEDT-TTF)2CU[N(CN)2]Br. The structural disorder for the d-Br salt was observed in the superstructure and in the terminal ethylenes.

    DOI: 10.1016/S0379-6779(98)00615-8

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  • X-ray structural study of 4k(F) superlattice in (DIDCNQI)(2)Ag Reviewed

    Y Nogami, R Moret, JP Pouget, Y Yamamoto, K Oshima, K Hiraki, K Kanoda

    SYNTHETIC METALS   102 ( 1-3 )   1778 - 1778   1999.6

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    X-ray diffuse scattering study using monochromatic camera revealed c*/2 satellite; reflections, indicating three dimensional 4k(F) CDW formation in quasi one-dimensional compound (DIDCNQI)(2)Ag below 200 K.

    DOI: 10.1016/S0379-6779(98)00612-2

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  • Structural modulation in theta-(BEDT-TTF)(2)CsM '(SCN)(4)[M '=Co, Zn] Reviewed

    Y Nogami, JP Pouget, M Watanabe, K Oshima, H Mori, S Tanaka, T Mori

    SYNTHETIC METALS   103 ( 1-3 )   1911 - 1911   1999.6

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    X-ray diffuse scattering study reveals presence of diffuse sheets directed along both the 2a*+c* and 2a*-c* directions in theta-(BEDT-TTF)(2)CsM'(SCN)(4) [M'=Co, Zn] at room temperature. These diffuse streaks condensed into two diffuse rods at the q(1)=(2/3, k, 1/3) and q(2)=(0. k, 1/2) reduced reciprocal position below 120K. Around 50K when the resistivity begins to increase, an enhancement of the q(2) intensity is observed.

    DOI: 10.1016/S0379-6779(98)00616-X

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  • High pressure structure of (DIDCNQI)(2)Cu Reviewed

    Nogami Y, Yamamoto Y, Hayashi S, Oshima K, Hiraki H, Kanoda K

    SYNTHETIC METALS   103 ( 1-3 )   2252   1999.6

  • High Pressure Structures of Organic Low Dimensional Conductor DCNQI Compounds Reviewed

    Y. Nogami, S. Hayashi, T. Date, K. Oshima, K. Hiraki, K. Kanoda, K. Hiraki, K. Kanoda

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu   7   404 - 406   1998

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    Using X-ray and DAC, room-temperature crystal structures under physical pressure(PP) were solved for DCNQI-Cu compounds which exhibit particular metal-insulator(M-I) transition owing to their electronic low dimensionality(CDW) and strong correlation(Mott). This M-I transition is known to be triggered with moderate(=small) PP or chemical substitution(chemical pressure:CP). Observed high pressure structures were compared with theoretical structure determinations. From the structural viewpoint, relation between PP and CP effects on the M-I transition was discussed, [organic conductor, metal-insulator transition, charge density wave, Mott transition, X-ray diffraction]. © 1998, The Japan Society of High Pressure Science and Technology. All rights reserved.

    DOI: 10.4131/jshpreview.7.404

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  • Low temperature structure of the alpha PRIME;-(BEDT-TTF)(2)IBr2 organic magnetic semiconductor Reviewed

    M Watanabe, M Nishikawa, Y Nogami, K Oshima, G Saito

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   31 ( 1 )   95 - 98   1997.7

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    A low temperature structure analysis for the alpha'-(BEDT-TTF)(2)IBr2 compound has been carried out. The temperatures studied include the regions where anomalous behavior of the conductivity and the susceptibility exist. It has been found that particular terminal ethylene groups of the BEDT-TTF molecules in the unit cell show anomalous temperature-dependent behavior. An anomalous behavior of the unit-cell parameter gamma has been also observed. These are considered to be related with the anomaly of the conductivity around 200 K. No remarkable change in unit-cell parameters has been observed corresponding to the change of the susceptibility around 60 K. It is possible to calculate overlap integrals between the BEDT-TTF molecules by using low-temperature crystal data. They show characteristic changes among three temperatures 300, 120, and 20 K.

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  • Low temperature structures of (BEDT-TTF)(3)CuBr4 Reviewed

    M Watanabe, Y Nogami, K Oshima, J Yamaura, T Enoki, G Saito

    SYNTHETIC METALS   86 ( 1-3 )   1983 - 1984   1997.2

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    Single crystal X-ray structure analyses and calculation of overlap integrals for (BEDT-TTF)(3)CuBr4 reveal an occurrence of structural trimerization among BEDT-TTF molecules below Te = 60.2 K. A possible relation between this structural change and the magnetic susceptibility decrement below Tc is discussed.

    DOI: 10.1016/S0379-6779(97)80988-5

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  • Single crystal X-ray study of pressure-induced metal-insulator transition in (DMeDCNQI)(2)Cu Reviewed

    Y Nogami, T Date, K Oshima, O Arimoto

    SYNTHETIC METALS   86 ( 1-3 )   2073 - 2074   1997.2

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    The structures of the metallic and the insulating phases of (DMeDCNQI)(2)CU were solved under pressures of up to 15.8 kbar at room temperature. An angle a representing the deformation of CuN4 tetrahedron around the Cu atom increases almost linearly with pressure at the rate of about 0.6 deg./kbar. Furthermore, an X-ray diffuse scattering study revealed the presence of a 3 c CDW superlattice structure above 12 kbar in the high pressure insulating phase.

    DOI: 10.1016/S0379-6779(97)81033-8

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  • Characteristic SDW and FISDW behavior in (DMET-TSeF)(2)X system Reviewed

    K Oshima, H Okuno, H Fujimura, Y Nogami, S Aonuma, R Kato

    SYNTHETIC METALS   86 ( 1-3 )   1965 - 1966   1997.2

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    The quasi one-dimensional system (DMET-TSeF)2X which is similar to (TMTSF)2X is studied. The remarkable magnetic and transport properties for the salts with X=AuI2, AuBr2 and AuCl2 are shown. It is shown from the magnetic measurement that the AuBr2 salt becomes SDW at ambient pressure and its easy-axis is along the most conducting a-axis. FISDW states has been observed for X=AuCl2 AuI2 at ambient pressure and X=AuBr2 under pressure respectively. Low temperature structural analyses have confirmed no superstructure to exist for the AuI2 and AuCl2 salts. Hall effect measurements have revealed the sign change of the Hall voltage(AuI2) and the plateau-like Hall voltage(AuCl2), but at the higher fields than those reported for TMTSF system.

    DOI: 10.1016/S0379-6779(97)80980-0

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  • A new highly conductive BO-(MeO)(2)TCNQ Langmuir-Blodgett film Reviewed

    K Ogasawara, T Ishiguro, S Horiuchi, H Yamochi, G Saito, Y Nogami

    SYNTHETIC METALS   86 ( 1-3 )   1835 - 1836   1997.2

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    A stable, highly conductive Langmuir-Blodgett (LB) film was developed with a charge-transfer (CT) complex of bisethylenedioxytetrathiafulvalene (BO) and dimethoxytetracyanoquinodimethane using the unique nature of BO molecules. The metallic temperature dependence of electrical conductivity was observed down to 180 K, showing a maximum of 13 S/cm, The X-ray diffraction measurements show the presence of three kinds of domains corresponding to CT complex, icosanoic acid and disordered CT complex regions, The behavior of macroscopic electrical conductivity is understood well by a percolation model consisting of metallic, semiconducting and insulating sites.

    DOI: 10.1016/S0379-6779(97)80927-7

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  • Percolation conduction in BO-C(10)TCNQ conductive Langmuir-Blodgett films Reviewed

    K Ogasawara, T Ishiguro, S Horiuchi, H Yamochi, G Saito, Y Nogami

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   58 ( 1 )   39 - 49   1997.1

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    The structure and electronic properties of the conductive Langmuir-Blodgett film consisting of bis(ethylenedioxy)tetrathiafluvalene- decyltetracyanoquinodimethane (BO-C(10)TCNQ) and icosanoic acid (IA) have been studied through the measurements of electrical conductivity, X-ray diffraction and electron spin resonance for samples with different mixing ration of BO-C(10)TCNQ to IA. The X-ray diffraction and ESR measurements indicate the coexistence of metallic, semiconducting and insulating domains. The temperature dependences of the electrical conductivity are reproduced by the calculation based on a modified two-dimensional percolation model consisting of three kinds of sites and their characteristics are understood well by the related phase diagram. Copyright (C) 1996 Elsevier Science Ltd

    DOI: 10.1016/S0022-3697(96)00098-4

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  • Structural phase transition in (BEDT-TTF)(3)CuBr4 at 60 K Reviewed

    M Watanabe, Y Nogami, K Oshima, JI Yamaura, T Enoki, G Saito

    SOLID STATE COMMUNICATIONS   100 ( 11 )   755 - 758   1996.12

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    Low temperature X-ray diffraction study for organic semiconductor (BEDT-TTF)(3)CuBr4 revealed structural phase transition from P2(1)/c to Pc by losing inversion and screw symmetries at 60.2 K where the magnetic susceptibility shows a steep decrease. Abrupt changes in (0k0) X-ray reflection intensity and lattice parameters proved that this phase transition has first-order nature. Structure analysis at 65.9 K verified that the average coordination number of Br around Cu is four. Copyright (C) 1996 Elsevier Science Ltd

    DOI: 10.1016/S0038-1098(96)00512-1

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  • Structural study of the highly conductive tridecylmethylammonium-Au(dmit)(2) Langmuir-Blodgett films Reviewed

    H Matsuzaki, K Ogasawara, T Ishiguro, Y Nogami, M Taoda, H Tachibana, M Matsumoto, T Nakamura

    SYNTHETIC METALS   74 ( 3 )   251 - 255   1995.10

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    The structure of the conductive Langmuir-Blodgett (LB) film consisting of tridecylmethylammonium-Au(dmit)(2) (3C10-Au) and arachidic acid is studied by the X-ray diffraction method and atomic force microscopy (AFM). The electrochemically ClO4--doped film is found to possess four phases with different interlayer spacings by the X-ray diffraction method. The intralayer molecular arrangement is found for the 3C10-Au matrix by AFM.

    DOI: 10.1016/0379-6779(95)03376-U

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  • STRUCTURAL STUDY OF NEUTRAL-IONIC TRANSITION IN DMTTF-CA Reviewed

    Y NOGAMI, M TAODA, K OSHIMA, S AOKI, T NAKAYAMA, A MIURA

    SYNTHETIC METALS   70 ( 1-3 )   1219 - 1220   1995.3

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    Dimethyltetrathiafulvalene-p-chloranil (DMTTF-CA), showing a particular neutral(N)-ionic(I) transition from a N phase into a N-I coexisting phase by cooling, was structural analyzed by X-ray at 29K, 48K, 109K and 293K Below Tc or 65K, changes observed in unit cell parameters, bond lengths and anisotropic temperature factors indicate 1) a increase in degree of charge transfer(CT) from a DMTTF donor to a CA acceptor and 2) a formation of a molecular dimerization, in I part of the coexisting phase. A possible staging superlattice was not observed.

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  • TEMPERATURE-DEPENDENCE OF LOCAL-STRUCTURE OF RB3C60 SUPERCONDUCTOR Reviewed

    T FUJIMOTO, Y KUBOZONO, H MAEDA, S EMURA, H ISHIDA, K OSHIMA, K KATO, S KASHINO, H YAMAZAKI, T ISHII, Y NOGAMI

    FULLERENE SCIENCE AND TECHNOLOGY   3 ( 1 )   69 - 77   1995

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    EXAFS studies on Rb3C60 are made as a function of temperature from 6 K to 300 K. It is found that the distance r(Rb-C) and the second, third and fourth cumulant terms of Debye-Waller factors, sigma(2), sigma(c)(3) and sigma(c)(4), show the anomalous behavior near T-c.

    DOI: 10.1080/153638X9508545734

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  • LOCAL-STRUCTURE OF METAL-IONS IN ARACHIDATE LANGMUIR-BLODGETT-FILM Reviewed

    S TAKEUCHI, Y NOGAMI, T ISHIGURO, H OYANAGI

    THIN SOLID FILMS   250 ( 1-2 )   243 - 248   1994.10

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    The fluorescence extended X-ray absorption fine structures near the Ba-L(3) edge of a Ba-arachidate (CH3(CH2)(18)COO2Ba) Langmuir-Blodgett film are investigated by using polarized X-rays from a synchrotron radiation source. From the analysis of the observed spectra for different incident angles, the absorption-site geometries are obtained. The distance from the Ba ion to the nearest neighbor oxygen atoms, lying almost in the Ba plane, is found to be 0.278 nm. Taking account of the reported structural data, a local structure model around the Ba ion is proposed.

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  • RECENT STRUCTURAL INVESTIGATIONS OF METALLIC POLYMERS Reviewed

    JP POUGET, Z OBLAKOWSKI, Y NOGAMI, PA ALBOUY, M LARIDJANI, EJ OH, Y MIN, AG MACDIARMID, J TSUKAMOTO, T ISHIGURO, AJ EPSTEIN

    SYNTHETIC METALS   65 ( 2-3 )   131 - 140   1994.8

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    Recent structural studies of the undoped and iodine-doped polyacetylenes (prepared by the Tsukamoto and co-workers method), PF6--doped polypyrrole and polyaniline emeraldine base and (hydrochloric acid and camphorsulfonic acid) salts are presented. Some key features of the polymer chain array and its evolution with the conditions of preparation are emphasized. Special attention has been devoted to characterization of the various sources of structural disorder in the relationship with high conductivity and related properties exhibited by these three families of polymers. Variation in the structural order in both crystalline and amorphous regions correlates directly with the electrical and optical properties of the metallic state.

    DOI: 10.1016/0379-6779(94)90174-0

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  • LOW-TEMPERATURE MAGNETORESISTANCE OF HIGHLY CONDUCTIVE POLYACETYLENE Reviewed

    H KANEKO, Y NOGAMI, T ISHIGURO

    PHYSICA B   194   1327 - 1328   1994.2

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    Low temperature resistivity of highly conductive iodine-doped polyacetylene changes systematically from metallic to nonmetallic with increase of disorder. The negative magnetoresistance in metallic region is ascribed to the effect of weak localization. Meanwhile the positive magnetoresistance found in nonmetallic region is explained by magnetic field effect to variable range hopping among localized states in a quasi 1D electron gas.

    DOI: 10.1016/0921-4526(94)90993-8

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  • OBSERVATION OF PHONON STOP BAND IN LANGMUIR-BLODGETT MULTILAYER FILM Reviewed

    S TAKEUCHI, Y NOGAMI, T ISHIGURO

    PHYSICA B   194   473 - 474   1994.2

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    Using superconducting tunnel junctions, phonon transmission for Langmuir-Blodgett (LB) multilayer has been studied spectroscopically. A film with 9 layers of Cd arachidate is formed on a sapphire substrate which passes longitudinal phonon as focusing mode. We find a pronounced decrease in transmission centering 420 GHz corresponding to phonon stop band.

    DOI: 10.1016/0921-4526(94)90566-5

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  • STRUCTURE OF HIGHLY CONDUCTING PF6--DOPED POLYPYRROLE Reviewed

    Y NOGAMI, JP POUGET, T ISHIGURO

    SYNTHETIC METALS   62 ( 3 )   257 - 263   1994.2

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    The structure of highly conducting PF6--doped polypyrrole, the room-temperature conductivity of which is approximately 1500 S/cm, is studied using X-ray 'monochromatic' Laue photographic methods. The 'crystalline' domain size along the polymer chain is estimated to be less than 20 angstrom, while adjacent chains are rather well ordered with spacing of 3.4 angstrom, suggesting that the system can be of two-dimensional nature. The influence of the structural properties on the high electrical conductivity is discussed.

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  • SUPERLATTICE STRUCTURAL TRANSITION IN THE ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)(2)CU[N(CN)(2)]BR Reviewed

    Y NOGAMI, JP POUGET, H ITO, T ISHIGURO, G SAITO

    SOLID STATE COMMUNICATIONS   89 ( 2 )   113 - 116   1994.1

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    By the X-ray ''monochromatic'' Laue photographic method, we observe the formation below 200 K of superlattice reflections in k-(BEDT-TTF)(2)Cu[N(CN)(2)]Br which exhibits the highest superconducting critical temperature at ambient pressure (T-c similar to 11.6 K) among the organic superconductors. This displacive structural transition doubles the lattice parameter along c. We discuss the driving force of this instability and the consequences of this structural transition on the electronic and lattice properties of this salt.

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  • 低次元物質の相転移

    野上 由夫

    日本結晶学会誌   36 ( 0 )   17 - 18   1994

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  • HIGH-RESOLUTION X-RAY STUDY ON ANOMALOUS DIFFRACTION PEAK SHIFT IN DIMERIZED LANGMUIR-BLODGETT SUPERLATTICE FILMS Reviewed

    Y NOGAMI, K OGASAWARA, S TAKEUCHI, T ISHIGURO, T NAKAJIMA, K OHSUMI, Y SHIMIZUGAWA

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   62 ( 9 )   3114 - 3126   1993.9

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    Structures of Langmuir-Blodgett (LB) superlattice films formed with alternately deposited fatty acid Cd salts with different alkyl-chain length are studied by high resolution X-ray diffraction method using a synchrotron radiation source. The remarkable diffraction peak shift is observed in the superlattice film. The shift is interpreted in terms of the Guinier effect in partially-disordered superlattice system. Simultaneous modulation of molecular position and of molecular scattering factor results in the peak shift. The effect of alkyl-chain species substitution and of cooling on the peak shift are also described. The partial disorder in the superlattice is caused by dissolution of LB film.

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  • LOW-TEMPERATURE ELECTRICAL-CONDUCTIVITY OF HIGHLY CONDUCTING IODINE-DOPED POLYACETYLENE Reviewed

    H KANEKO, Y NOGAMI, T ISHIGURO, H NISHIYAMA, H ISHIMOTO, A TAKAHASHI, J TSUKAMOTO

    SYNTHETIC METALS   57 ( 2-3 )   4888 - 4893   1993.4

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    The low temperature electrical conductivities of heavily iodine-doped polyacetylene with different degrees of disorder are reported. The sample with room-temperature conductivity of 1.0 x 10(5) S/cm showed weak temperature dependence below 1 K down to 0.8 mK. With moderate increase of disorder, logarithmic temperature dependence was observed. The results are interpreted in terms of scattering of conduction carriers accompanying change of atomic configurations of equivalent energy in the polymer backbone, after similar process in amorphous metal alloys.

    DOI: 10.1016/0379-6779(93)90834-J

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  • HIGH-ELECTRIC-FIELD EFFECT ON THE CONDUCTIVITY OF IODINE-DOPED POLYACETYLENE Reviewed

    Y NOGAMI, M YAMASHITA, H KANEKO, T ISHIGURO, J TSUKAMOTO, A TAKAHASHI

    SYNTHETIC METALS   57 ( 2-3 )   4854 - 4859   1993.4

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    The conductivities of iodine-doped new polyacetylenes with room-temperature values of 7.7 x 10(3) S/cm and 2.6 x 10(4) S/cm were measured as a function of applied electric field in the temperature range of 77 K to 4.2 K. It is shown that the behavior deviated obviously from the Sheng model which has been widely adopted in explaining temperature dependence for conventional polyacetylene with lower conductivity.

    DOI: 10.1016/0379-6779(93)90828-K

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  • NONLINEAR ELECTRICAL-CONDUCTIVITY OF HIGHLY CONDUCTING IODINE-DOPED POLYACETYLENE Reviewed

    Y NOGAMI, M YAMASHITA, H KANEKO, T ISHIGURO, A TAKAHASHI, J TSUKAMOTO

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   62 ( 2 )   664 - 671   1993.2

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    Non-ohmic behaviors under high electric field were investigated for highly conducting iodine-doped polyacetylene at different temperatures. The field dependence was enhanced with decrease of measuring temperature and conductivity. Through systematic numerical analysis we show that the high-field characteristics at different temperatures cannot be described consistently by Sheng model which has been utilized for analyzing the temperature dependence of conventional polyacetylene.

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  • LOGARITHMIC TEMPERATURE-DEPENDENCE OF RESISTIVITY IN HEAVILY DOPED CONDUCTING POLYMERS AT LOW-TEMPERATURE Reviewed

    T ISHIGURO, H KANEKO, Y NOGAMI, H ISHIMOTO, H NISHIYAMA, J TSUKAMOTO, A TAKAHASHI, M YAMAURA, T HAGIWARA, K SATO

    PHYSICAL REVIEW LETTERS   69 ( 4 )   660 - 663   1992.7

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    Electrical resistivities of heavily doped polyacetylene and polypyrrole exhibit a wide range of temperature variation as a function of the degree of disorder. Thermal activation behavior is found for the strongly disordered state, while a weak temperature dependence down to the mK region is found for the weakly disordered state. In the intermediate region we found the resistivity represented by a logT dependence, in a manner similar to amorphous metals. As a cause of the logT dependence, the possibility of scattering via interaction with molecular configurations possessing low-energy internal degrees of freedom is considered.

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  • UNUSUAL X-RAY-DIFFRACTION VECTOR SHIFT OBSERVED IN HETEROGENEOUS LANGMUIR-BLODGETT MULTILAYER FILMS Reviewed

    Y NOGAMI, K OGASAWARA, S TAKEUCHI, T ISHIGURO, K OHSUMI, Y SHIMIZUGAWA

    ELECTRICAL, OPTICAL, AND MAGNETIC PROPERTIES OF ORGANIC SOLID STATE MATERIALS   247   835 - 840   1992

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    DOI: 10.1557/PROC-247-835

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  • SUPERCONDUCTING TRANSITION IN KAPPA-BEDT-TTF SALTS UNDER MAGNETIC-FIELD Reviewed

    H ITO, Y NOGAMI, M WATANABE, T ISHIGURO, T KOMATSU, G SAITO, N HOSOITO

    ELECTRICAL, OPTICAL, AND MAGNETIC PROPERTIES OF ORGANIC SOLID STATE MATERIALS   247   495 - 500   1992

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    DOI: 10.1557/PROC-247-495

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  • SUPERCONDUCTING TRANSITION IN KAPPA-(BEDT-TTF)2CU[N(CN)2]BR UNDER MAGNETIC-FIELD Reviewed

    H ITO, M WATANABE, Y NOGAMI, T ISHIGURO, T KOMATSU, G SAITO, N HOSOITO

    PHYSICA C   185   2659 - 2660   1991.12

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    Interlayer and intralayer coherence lengths of kappa-(BEDT-TTF)2Cu[N(CN)2]Br are derived as xi-b(0) = 6 +/- 2 angstrom, xi-ac(0) = 24 +/- 5 angstrom, respectively, by magnetic measurement. The renormalized theory of the order parameter fluctuation near the superconducting transition region was employed for the analysis. The broad resistive transitions under magnetic field are discussed on the same footing.

    DOI: 10.1016/0921-4534(91)91451-9

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  • Magnetic determination of ginzburg-landau coherence length for organic superconductor κ-(BEDT-TTF)2 X (X = Cu(NCS)2, CuLN(CN)2]Br): Effect of isotope substitution Reviewed

    Hiroshi Ito, Masashi Watanabe, Yoshio Nogami, Takehiko Ishiguro, Tokutaro Komatsu, Gunzi Saito, Nobuyoshi Hosoito

    Journal of the Physical Society of Japan   60   3230 - 3233   1991.10

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    The Ginzburg-Landau coherence lengths are determined from the temperature dependence of the magnetization by fitting measured results with the renormalization theory of the fluctuation developed for layered superconductors. The derived interlayer coherence lengths are 6 ± 2 Å and 3.2 ± 0.5 Å for κ-(BEDTTTF)2 Cu[N(CN)2]Br and ,κ-(BEDT-TTF)2Cu(NCS)2, respectively, which are remarkably shorter than the interlayer spacing. It is also found that these coherence lengths are virtually unaffected by isotope substitution in BEDT-TTF molecules.

    DOI: 10.1143/JPSJ.60.3230

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  • OVERVIEW OF ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)2[CU(NCS)2] AND ITS RELATED MATERIALS Reviewed

    G SAITO, H YAMOCHI, T NAKAMURA, T KOMATSU, T ISHIGURO, Y NOGAMI, Y ITO, H MORI, K OSHIMA, M NAKASHIMA, S UCHIDA, H TAKAGI, S KAGOSHIMA, T OSADA

    SYNTHETIC METALS   42 ( 1-2 )   1993 - 1998   1991.5

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    Crystal structures and physical properties of organic superconductors kappa-(BEDT-TTF)2Cu(NCS)2, kappa-(BEDT-TTF)2Cu[N(CN)2]Br and alpha-(BEDT-TTF)2[NH4Hg(SCN)4] are discussed. The Cu(NCS)2 salt shows an inverse isotope effect. The Cu[N(CN)2]Br salt shows Tc of 11.7-11.8K. Conductivities, Hc2 values and lattice parameters of these kappa-type salts are compared.

    DOI: 10.1016/0379-6779(91)91998-P

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  • TENSILE STRAIN EFFECTS ON KAPPA-(BEDT-TTF)2CU(NCS)2 Reviewed

    T ISHIGURO, H ITO, Y NOGAMI, Y UEBA, H KUSUHARA

    SYNTHETIC METALS   42 ( 1-2 )   1911 - 1914   1991.5

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    Through the comparison of uniaxial and biaxial tensile strain experiments with the calculated, the dominance of the interlayer interaction for the superconductivity and the resistance maximum in kappa-(BEDT-TTF)2Cu(NCS)2 is presented.

    DOI: 10.1016/0379-6779(91)91979-K

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  • ELECTRONIC STATE DENSITY OF HIGHLY CONDUCTING POLYACETYLENE Reviewed

    Y NOGAMI, H KANEKO, T ISHIGURO, N HOSOITO, J TSUKAMOTO, A TAKAHASHI

    SYNTHETIC METALS   41 ( 1-2 )   117 - 120   1991.4

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    The density of states of heavily I-doped highly conducting polyacetylene (HCPA) is evaluated through the magnetic susceptibility and the thermoelectric power measurements. According to the magnetic susceptibility, the density grows from approximately 4 % (in I-3-unit) doping level, in agreement with previous reports, but the attained value at approximately 9 % (saturating doping level) becomes larger than that for conventional polyacetylene.

    DOI: 10.1016/0379-6779(91)91015-3

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  • LOW-TEMPERATURE TRANSPORT-PROPERTIES OF HIGHLY CONDUCTING POLYACETYLENE Reviewed

    Y NOGAMI, H KANEKO, H ITO, T ARAI, A MATSUBARA, T ISHIGURO, N TOYOTA, T SASAKI, J TSUKAMOTO, A TAKAHASHI

    SYNTHETIC METALS   41 ( 1-2 )   95 - 98   1991.4

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    The temperature dependence of the electrical conductivity of the newly developed highly conducting polyacetylene, down to 60 mK, and its high field magnetoconductance up to 15 T are presented. The observed positive magnetoconductance for the most conducting sample exceeds by far the value based on the weak localization theory. The low temperature transport properties vary drastically with small change in the room-temperature conductivity, suggesting that the metallic conduction is realized in the scheme close to metal-nonmetal boundary.

    DOI: 10.1016/0379-6779(91)91008-X

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  • LOW-TEMPERATURE ELECTRICAL-CONDUCTIVITY OF HIGHLY CONDUCTING POLYACETYLENE IN A MAGNETIC-FIELD Reviewed

    NOGAMI Y, KANEKO H, ITO H, ISHIGURO T, SASAKI T, TOYOTA N, TAKAHASHI A, TSUKAMOTO J

    Physical Review B   43 ( 14 )   11829 - 11839   1991

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  • ON THE METALLIC STATES IN HIGHLY CONDUCTING IODINE-DOPED POLYACETYLENE Reviewed

    Y NOGAMI, H KANEKO, T ISHIGURO, A TAKAHASHI, J TSUKAMOTO, N HOSOITO

    SOLID STATE COMMUNICATIONS   76 ( 5 )   583 - 586   1990.11

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  • HIGH-RESOLUTION X-RAY-SCATTERING STUDY OF THE ANION ORDERING PHASE-TRANSITION OF (TMTSF)2CLO4 Reviewed

    JP POUGET, S KAGOSHIMA, T TAMEGAI, Y NOGAMI, K KUBO, T NAKAJIMA, K BECHGAARD

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   59 ( 6 )   2036 - 2053   1990.6

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  • THE SUPERSTRUCTURE OF THE ORGANIC SUPERCONDUCTOR BETA-(BEDT-TTF)2I3 UNDER PRESSURE Reviewed

    Y NOGAMI, S KAGOSHIMA, H ANZAI, M TOKUMOTO, N MORI, N KINOSHITA, G SAITO

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   59 ( 1 )   259 - 265   1990.1

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  • UNIAXIAL-STRESS EFFECTS ON ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)2CU(NCS)2 Reviewed

    T ISHIGURO, H ITO, Y NOGAMI, Y UEBA, H KUSUHARA

    ORGANIC SUPERCONDUCTIVITY   123 - 131   1990

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  • STRUCTURAL STUDIES OF (TMTSF)2SBCL2F4, ALPHA-(BEDT-TTF)2L3 AND SOME ORGANIC SUPERCONDUCTORS FOUND RECENTLY Reviewed

    S KAGOSHIMA, Y NOGAMI

    JOURNAL OF MOLECULAR ELECTRONICS   5 ( 4 )   201 - 206   1989.10

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  • 2K-SUPERCONDUCTING STATE WITH LESS DISORDER IN THE ORGANIC SUPERCONDUCTOR BETA-(BEDT-TTF)2I3 Reviewed

    S KAGOSHIMA, M HASUMI, Y NOGAMI, N KINOSHITA, H ANZAI, M TOKUMOTO, G SAITO

    SOLID STATE COMMUNICATIONS   71 ( 10 )   843 - 846   1989.9

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  • A CHANGE OF THE SUPERSTRUCTURE AND AN ASSOCIATED RISE OF THE SUPERCONDUCTING CRITICAL-TEMPERATURE IN THE ORGANIC SUPERCONDUCTOR BETA-(BEDT-FFT)2I3 Reviewed

    S KAGOSHIMA, Y NOGAMI, M HASUMI, H ANZAI, M TOKUMOTO, G SAITO, N MORI

    SOLID STATE COMMUNICATIONS   69 ( 12 )   1177 - 1180   1989.3

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  • PHYSICAL-PROPERTIES OF BETA-(BEDT-TTF)2ICL2 Reviewed

    A UGAWA, Y OKAWA, K YAKUSHI, H KURODA, A KAWAMOTO, J TANAKA, M TANAKA, Y NOGAMI, S KAGOSHIMA, K MURATA, T ISHIGURO

    SYNTHETIC METALS   27 ( 1-2 )   A407 - A412   1988.12

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  • STRUCTURAL-PROPERTIES OF ORGANIC SUPERCONDUCTORS (DMET)2X AND (BEDT-TTF)2CU(NCS)2 Reviewed

    S KAGOSHIMA, Y NOGAMI

    SYNTHETIC METALS   27 ( 1-2 )   A299 - A304   1988.12

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  • X-Ray Studies of Structural Changes in Superconducting and Non-Superconducting BEDT-TTF Salts : III. Organics :

    Seiichi Kagoshima, Yoshio Nogami

    JJAP series   1   181 - 184   1988

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  • X-RAY EVIDENCE FOR STRUCTURAL-CHANGES IN THE ORGANIC CONDUCTORS, ALPHA-(BEDT-TTF)2I3, ALPHA-(BEDT-TTF)2IBR2 AND BETA-(BEDT-TTF)2I3 Reviewed

    Y NOGAMI, S KAGOSHIMA, T SUGANO, G SAITO

    SYNTHETIC METALS   16 ( 3 )   367 - 377   1986.12

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  • STRUCTURAL-CHANGES IN SUPERCONDUCTING BEDT-TTF SALTS

    Y NOGAMI, S KAGOSHIMA, G SAITO

    NIPPON KAGAKU KAISHI   1986 ( 3 )   490 - 496   1986.3

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    Relations are investigated between electrical and structural properties in organic superconductors bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) salts. It is known that the superconductivity transition temperature T&lt;SUB&gt;c&lt;/SUB&gt; of &amp;beta;-(BEDT-TTF)&lt;SUB&gt;2&lt;/SUB&gt;I&lt;SUB&gt;3&lt;/SUB&gt; salts is raised from 1.5 to 8 K when the sample experiences high pressures. Furthermore, at ambient pressure, an incommensurate superstructure is formed with the wave vector q= (0.08, 0.27, 0.205) below 200 K in this salt. With the hypothesis that the increase of T&lt;SUB&gt;c&lt;/SUB&gt; is brought about by a suppression of the growth of the superstructure, and that the superstructure is hardly formed in samples which experienced high pressures, the temperature dependence of satellite intensities is measured by X-ray diffraction in those samples. A negative result is obtained for this hypothesis. Namely the behavior of the superstructure is found to be insensitive to pressurization. However, this conclusion does not exclude the possible change of the superstructure in a small volume of crystals, which can hardly be detected by X-ray diffraction.&lt;BR&gt;A salt of (BEDT-TTF)&lt;SUB&gt;2&lt;/SUB&gt;IBr&lt;SUB&gt;2&lt;/SUB&gt; shows semiconducting properti es and its activation energy increases with decreasing temperature. It is found that a molecular dimerization occurs with temperature decreasing from room temperature. This dimerization is considered to cause the increase of the activation energy. In this salt, another structural change seems to take place near 130 K.

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  • X-RAY STUDY OF FIELD-INDUCED DEFORMATION OF SLIDING CDW IN K0.30MOO3 Reviewed

    T TAMEGAI, K TSUTSUMI, S KAGOSHIMA, Y KANAI, H TOMOZAWA, M TANI, Y NOGAMI, M SATO

    SOLID STATE COMMUNICATIONS   56 ( 1 )   13 - 16   1985

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Books

  • Laue法による構造相転移と超格子 Reviewed

    野上由夫 ( Role: Sole author)

    日本結晶学会 日本の結晶学(II)-その輝かしい発展-竹中章郎編  2014.10 

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    Total pages:514   Responsible for pages:2   Language:Japanese Book type:Scholarly book

  • Topology in Orderd Phases

    *Yoshio Nogami他( Role: Sole author ,  Structure Analysese of Topological Crystals Using Synchrotron Radiation)

    World Scientific  2006.8 

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  • Topology in Orderd Phases

    K. Yamamoto, T. Ito, N. Ikeda, S. Horita, N. Irie, Y. Nogami, T. Tsuneta, S. Tanda( Role: Joint author ,  Development of X-ray Analysis Method for Topological Crystals)

    World Scientific  2006.8 

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    Responsible for pages:86-94   Language:English

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  • 有機擬一次元物質の秩序無秩序転移と電荷不均一化 Reviewed

    伊藤崇芳 *野上由夫

    日本結晶学会誌 48巻  2006.1 

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    Responsible for pages:6  

  • Nanonetwork Materials

    Kokichi Oshima, Yoshio Nogami*, Takashi Kambe, Nobuaki Nagao, Motoyasu Fujiwara(The Structural and Magnetic Properties in TDAE-Fullerene System)

    American Institute of Physics  2001.4 

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    Responsible for pages:393-396  

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MISC

  • 7pBJ-4 Hall effect of rare-earth compounds RNiC_2(R=Sm,Nd)

    Nomura K., Kondo R., Nogami Y.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   341 - 341   2014.8

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  • 27aCJ-7 Structural phase transition in RNiC_2(R=Y,Ho,Er)

    Kondo Ryusuke, Maeda Hiroyuki, Nomura Katsufumi, Nogami Yoshio

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   550 - 550   2014.3

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  • 微弱信号検出における実験室とKEK-PFとのコラボ:有機結晶における放射線損傷の克服

    野上由夫, 近藤隆祐, 中尾朗子, 小林賢介, 熊井玲児, 山崎裕一, 中尾裕則

    物構研サイエンスフェスタ要旨集   2013   2014

  • Enhancement of Electronic Specific Heat by Trimmer Order Melting in Magnetoplumbite-type Vanadium Oxides Li_2Na_xK_<1-x>V_<10>O_<19>

    Sawai N., Tokuyama T., Murakawa H., Nogami Y., Nakao H., Kumai R., Hanasaki N.

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   562 - 562   2013.8

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  • 28pXX-2 Low temperature x-ray diffraction for Ba_4Ru_3O_<10> single crystals

    Igarashi T., Okazaki R., Terasaki I., Yasui Y., Nogami Y., Klein Yannick, Rousse Gwenaelle

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   679 - 679   2013.3

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  • 29aXY-11 Local order of Nb displacements in Pyrochore Niobates

    Torigoe S., Kanda N., Nogami Y., Nakao H., Murakawa H., Hanasaki N.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   697 - 697   2013.3

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  • 27pXN-5 Crystal structure of (TMTTF)_2Br at low temperture

    Toda Atsuki, Kondo Ryusuke, Nogami Yoshio, Nakao Akiko, Kumai Reiji

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   939 - 939   2013.3

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  • 26aXZE-10 Single crystal preparation and property of RNiC_2

    Maeda H., Yamamoto N., Kondo R., Nogami Y.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   578 - 578   2013.3

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  • (TMTTF)2Brの電荷不均一と(TMTSF)2PF6のSDW/CDW共存

    戸田敦基, 近藤隆祐, 野上由夫, 中尾朗子, 熊井玲児

    物構研サイエンスフェスタ要旨集   1st   2013

  • 20aFG-5 Transport properties in Magnetoplumbite-tvnc Vanadium Oxides Li_2AV_<10.5>O_<19>(A=Na, K)

    Tokuyama T., Nogami Y., Koike M., Hanasaki N.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   497 - 497   2012.8

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  • 20aPSB-33 X-ray magnetic scattering study of TbNiC_2

    Shimomura S., Nakao H., Yamamoto N., Nogami Y., Hanasaki N., Kosaka M., Onodera H.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   532 - 532   2012.8

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  • 26pBK-2 Modulation Wavevector for θ-(BEDT-TTF)2CsZn(SCN)4 under Uniaxial Strain

    Nogami Y., Tanimoto Y., Kondo R., Hanasaki N.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   907 - 907   2012.3

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  • 27aYC-10 Charge Density Wave and Magneto Resistance for DyNiC_2 and CeNiC_2

    Maeda H., Yamamoto N., Nogami Y., Kondo R., Hanasaki N., Shimomura S.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   685 - 685   2012.3

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  • 27aBK-4 Precursory CDW fluctuation observed above SDW transition temperature for (TMTSF)_2PF_6

    Toda A., Nogami Y., Yamamoto N., Kondo R., Hanasaki N.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   918 - 918   2012.3

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  • 24pBK-2 Symmetry Change in κ-(BEDT-TTF)_2Cu_2(CN)_3 at LT.

    Yamamoto N., Nogami Y., Kondo R., Terasaki I., Sasaki T., Maesato M., Hanasaki N., Nakao A.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   876 - 876   2012.3

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  • 25pPSB-48 Synchrotron x-ray diffraction study of RNiC_2 (R=Tb, Gd)

    Shimomura S., Nogami Y., Hanasaki N., Yamamoto N., Nakao H., Nakao A., Kosaka M., Onodera H.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   656 - 656   2012.3

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  • 26pED-12 Magnetic Phase Diagram and Structural Modulation of Rare-earth Compound GdNiC_2

    Mikami K, Hanasaki N, Yokota K, Nogami Y, Shimomura S, Nakao H, Kosaka M, Onodera H

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   2011.3

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  • 25aTA-4 Structural study of θ-(BEDT-TTP)_2CsZn(SCN)_4 under uniaxial strain

    Kondo R, Kagoshima S, Kumai R, Nakao A, Tanimoto Y, Nogami Y, Sawa H

    Meeting abstracts of the Physical Society of Japan   66 ( 1-4 )   2011.3

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  • 26pED-11 Modolated structures and successive phase transitions in GdNiC_2

    Shimomura S, Nogami Y, Hanasaki N, Yokota K, Nakao H, Nakao A, Kosaka M, Onodera H

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   2011.3

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  • 22aTR-8 Magnetic-field-induced Melting of Charge Order in Phthalocyanine-Molecular Conductor Exhibiting Giant Magnetoresistance

    Hanasaki N, Tateishi T, Nogami Y, Matsuda M, Tajima H, Takigawa M, Naito T, Inabe T

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   2011

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  • 26aTB-6 Magnetic-field-induced suppression of charge order in Phthalocyanine-molecular conductor exhibiting giant magnetoresistance.

    Tateishi T, Hanasaki N, Nogami Y, Matsuda M, Tajima H, Takigawa M, Naito T, Inabe T

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   2011

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  • 23aGB-1 Geometrical charge frustration in Pyrochlore Niobates

    Torigoe S, Hanasaki N, Nogami Y, Matsumura D, Yoshii K, Yoneda Y, Nishihata Y

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   2011

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  • 20pGD-4 Magnetoresistance in rare-earth intermetallic compounds RNiC_2

    Hanasaki N., Nogami Y., Yokota K., Mikami K., Kakinuma M., Shimomura S., Kosaka M., Onodera H.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   553 - 553   2010.3

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  • 20aGT-9 Low Temperature Charge Order Competition and Associated Nonlinear Conduction in Quenched θ-(BEDT-TTF)_2RbZn(SCN)_4

    Nogami Y., Ogura M., Matsuka T., Hanasaki N., Watanabe M., Noda Y., Terasaki I., Mori H., Mori T.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   857 - 857   2010.3

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  • 22pPSA-27 Structural Evidence for a SP Ground State in Si-subsitituded CuGeO_3

    Zhang Y., Nogami Y., Hanasaki N., Morigensudu, Matsuka T.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   504 - 504   2010.3

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  • 24aPS-137 X-ray Absorption Spectra and Ferroelectricity in Pyrochlore Niobates

    Nara S, Torigoe S, Hanasaki N, Nogami Y, Matsumura D, Yoshii K, Yoneda Y, Nishihata Y

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   2010

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  • θ‐(BEDT‐TTF)2MZn(SCN)4(M=Cs,Rb)の非線形誘電率と電荷秩序ギャップ

    寺崎一郎, 稲田太一, 田崎秀一, 野上由夫, 渡邉真史, 森初果, 森健彦

    日本物理学会講演概要集   64 ( 1 )   853   2009.3

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  • θ‐(BEDT‐TTF)2MZn(SCN)4(M=Cs,Rb)の低温電荷秩序構造

    野上由夫, 山本健一郎, 柿沼光之, 小椋美鈴, 横田研太郎, 花咲徳亮, 池田直, 神戸高志, 張宇, 眞苅伸明, 立石拓麻, 渡邉真史, 小山内雅人, 野田幸男, 寺崎一郎, 稲田太一, 大西祐也, 伊藤崇芳, 豊川秀訓, 大隅寛幸, 森初果, 森健彦

    日本物理学会講演概要集   64 ( 1 )   853   2009.3

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  • 30aYF-3 Nonlinear dielectric constants and charge ordering gap in θ-(BEDT-TTF)_2MZn(SCN)_4 (M=Cs,Rb)

    Terasaki I., Inada T. S., Tasaki S., Nogami Y., Watanabe M., Mori H., Mori T.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   853 - 853   2009.3

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  • 27pTL-3 Structural study of RENiC_2 in magnetic fields

    Kakinuma M., Hanasaki N., Nogami Y., Shimomura S., Onodera H.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   562 - 562   2009.3

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  • 30aYF-2 LT CO Structure in θ-(BEDT-TTF)_2MZn(SCN)_4 (M=Cs,Rb)

    Nogami Y, Magari N, Tateishi T, Watanabe M, Osanai M, Noda Y, Terasaki I, Inada T, Onishi Y, Ito T, Toyokawa H, Yamamoto K, Ohsumi H, Mori H, Mori T, Kakinuma M, Ogura M, Yokota K, Hanasaki N, Ikeda N, Kambe T, Chou U

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   2009

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  • 28pYC-1 Magnetization of Molecular Conductor TPP[Fe(Pc)(CN)_2]_2 under High Magnetic Field

    Tateishi T, Hanasaki N, Nogami Y, Tokunaga M, Matsuda M, Tajima H, Naito T, Inabe T

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   2009

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  • 高圧下のθ‐(BEDT‐TTF)2CsZn(SCN)4における電荷秩序相と構造変調

    小山内雅人, 野田幸男, 渡邉真史, 野上由夫, 寺崎一郎, 森初果, 森健彦

    日本物理学会講演概要集   63 ( 2 )   775   2008.8

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  • θ‐(BEDT‐TTF)2RbZn(SCN)4の急冷・非線形伝導状態における電荷秩序競合と格子の変調

    渡邉真史, 山本健一郎, 柿沼光之, 野上由夫, 花咲徳亮, 池田直, 神戸高志, 横田研太郎, 伊藤崇芳, 豊川秀訓, 大隅寛幸, 小山内雅人, 野田幸男, 稲田太一, 寺崎一郎, 森初果, 森健彦

    日本物理学会講演概要集   63 ( 2 )   775   2008.8

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  • 21aTC-9 Photoemission spectroscopy in molecular conductor TPP[Fe(Pc)(CN)_2]_2

    Hanasaki N, Tanabe M, Wakita T, Muraoka Y, Yokoya T, Nogami Y, Matsuda M, Tajima H, Taketsugu T, Yu Derrick Ethelbhert C, Naito T, Inabe T

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   2008.8

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  • Θ‐(BEDT‐TTF)2RbZn(SCN)4の超急冷相での変調構造

    山本健一郎, 花咲徳亮, 野上由夫, 柿沼光之, 横田研太郎, 池田直, 神戸高志, 渡邉真史, 野田幸男, 寺崎一郎, 稲田太一, 森初果, 森健彦, 伊藤崇芳, 豊川秀訓, 大隅寛幸

    日本物理学会講演概要集   63 ( 1 )   818   2008.2

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  • o‐TaS3における電場誘起ディスコメンシュレーション

    稲垣克彦, 坪田雅功, 東山和樹, 市村晃一, 丹田聡, 山本健一郎, 花咲徳亮, 池田直, 野上由夫, 伊藤崇芳, 豊川秀訓

    日本物理学会講演概要集   63 ( 1 )   753   2008.2

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  • θ‐(BEDT‐TTF)2CsZn(SCN)4における超格子の圧力変化

    渡邉真史, 小山内雅人, 野田幸男, 野上由夫, 寺崎一郎, 森初果, 森健彦

    日本物理学会講演概要集   63 ( 1 )   819   2008.2

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  • 23aTF-10 Diffuse streak in phthalocyanine-molecular conductor TPP[Fe(Pc)(CN)_2]_2

    Hanasaki N., Tanabe M., Nogami Y., Ikeda N., Matsuda M., Tajima H., Takigawa M., Inabe T.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   796 - 796   2008.2

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  • 24pTF-1 Modulated structure of θ-(BEDT-TTF)_2RbZn(SCN)_4 in the quenching phase

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   818 - 818   2008.2

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  • 24pTF-5 Superstructures in θ-(BEDT-TTF)_2CsZn(SCN)_4 under Pressure.

    Watanabe Masashi, Osanai Masato, Noda Yukio, Nogami Yoshio, Terasaki Ichiro, Mori Hatsumi, Mori Takehiko

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   819 - 819   2008.2

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  • 26aWB-5 Satellite reflection measurement of β"-(BEDT-TTF)_2AuBr_2

    Kakinuma M., Hanasaki N., Nogami Y., Kondo R., Kagoshina S.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   845 - 845   2008.2

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  • 26aWB-4 Electrical properties of b"-(BEDT-TTF)_2AuBr_2

    Kondo R., Kagoshima S., Kakinuma M., Hanasaki N., Nogami Y.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   844 - 844   2008.2

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  • θ‐(BEDT‐TTF)2CsM(SCN)4における電流密度に依存するエネルギーギャップ

    寺崎一郎, 澤野文章, 須子友博, 田崎秀一, 森初果, 森健彦, 野上由夫, 池田直, 渡邉真史, 野田幸男

    日本物理学会講演概要集   62 ( 2 )   844   2007.8

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  • 時間分割2次元ディテクタを用いたθ‐(BEDT‐TTF)2CsZn(SCN)4の電流下X線回折実験

    渡邉真史, 山本健一郎, 伊藤崇芳, 花咲徳亮, 池田直, 野上由夫, 豊川秀訓, 大隅寛幸, 野田幸男, 稲田太一, 須子友博, 寺崎一郎, 森初果, 森健彦

    日本物理学会講演概要集   62 ( 2 )   844   2007.8

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  • 19pRJ-9 Low temperature structures in (TMTSF)_2X1

    Nakashima Y., Hanasaki N., Nogami Y., Kambe T., Oshima K.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   836 - 836   2007.2

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  • 21aRA-6 Temperature variation of crystal lattice and spin-Peierls transition in θ-(BEDT-TTF)_2RbZn(SCN)_4

    Watanabe Masashi, Nogami Yoshio, Noda Yukio, Mori Hatsumi

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   856 - 856   2007.2

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  • 21pRA-2 Giant lattice variation in θ-(BEDT-TTF)_2CsZn(SCN)_4 in nonlinear conducting state

    Watanabe Masashi, Yamamoto Kenichiro, Nakashima Yusaku, Ito Takayoshi, Tanabe Makoto, Hanasaki Noriaki, Ikeda Naoshi, Nogami Yoshio, Osumi Hiroyuki, Toyokawa Hidenori, Noda Yukio, Terasaki Ichiro, Sawano Fumiaki, Suko Tomohiro, Mori Hatsumi, Mori Takehiko

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   863 - 863   2007.2

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  • 18pRD-12 Strain Analysis of TaSe_3 Topological Crystals by Synchrotron X-ray Diffraction Measurements

    Yamamoto K., Ito T., Ikeda N., Nogami Y., Horita S., Matsuura T., Tanda S., Tsuneta T.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   769 - 769   2007.2

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  • 19pRJ-6 Low Temperature Structure of TMTTF_2X

    Nogami Yoshio, Ito Takayoshi, Nakashima Yusaku, Yamamoto Kenichiro, Ikeda Naoshi, Nakamura Toshikazu

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   835 - 835   2007.2

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  • 25pYF-4 Lattice variation of θ-(BEDT-TTF)_2CsZn(SCN)_4 in nonlinear conducting state

    Watanabe Masashi, Ito Takayoshi, Yamamoto Kenichiro, Nakashima Yusaku, Hanasaki Noriaki, Ikeda Naoshi, Nogami Yoshio, Osumi Hiroyuki, Toyokawa Hidenori, Noda Yukio, Terasaki Ichiro, Sawano Fumiaki, Suko Tomohiro, Mori Hatsumi, Mori Takehiko

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   698 - 698   2006.8

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  • 30aRB-6 Low temperature crystal structure for (DMET)_2BF_4

    Kanno N., Nogami Y., Kikuchi K., Nishikawa H.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   846 - 846   2006.3

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  • 30aRB-11 Low-temperature structure of M_2P-TCNQF_4

    Ito T., Yamamoto K., Ikeda N., Nogami Y., Matsuzaki H., Okamoto H.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   847 - 847   2006.3

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  • 27pTE-6 Development of X-ray and neutron transparent pulse magnets

    Ohmichi E., Ikeda N., Nogami Y., Osada T.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   434 - 434   2006.3

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  • 30pUF-1 Study of electrical resistivities of RAgSb_2(R=Ce_x,La_<1-x>)

    Watanabe Y., Inada Y., Nogami Y.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   658 - 658   2006.3

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  • 30pUE-11 Development of Low Temperature Diffuse Scattering Camera in High Magnetic Field

    Horita S., Ito T., Irie N., Ikeda N., Nogami Y., Nagao N., kanbe T., Oshima K., Isobe M., Ueda Y.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   657 - 657   2006.3

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  • 28aRB-1 Crystal and modulation structures of α-(BEDT-TTF)_2MHg(SCN)_4

    Irie N., Ito T., Yamamoto K., Ikeda N., Nogami Y., Mori H.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   819 - 819   2006.3

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  • 27pRB-7 Time resolved X-ray diffraction study for θ-(BEDT-TTF)_2CsM'(SCN)_4 under pulse electric current at low temperature

    Watanabe Masashi, Ito Takayoshi, Ikeda Naoshi, Yamamoto Kenichiro, Toyokawa Hidenori, Nakashima Yusaku, Horita Shintaro, Nogami Yoshio, Noda Yukio, Terasaki Ichiro, Sawano Fumiaki, Mori Hatsumi, Mori Takehiko

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   810 - 810   2006.3

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  • 27pXF-6 CDW Satellite Reflection Measurement of NbSe_3 Ring Crystal

    Yamamoto K., Ito T., Ikeda N., Nogami Y., Horita S., Matsuura T., Tanda S., Tsuneta T.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   772 - 772   2006.3

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  • Anion Order-disorder Transition and Charge Disproportionation in Organic Quasi One-dimensional Compounds

    ITO Takayoshi, NOGAMI Yoshio

    X-RAYS   48 ( 1 )   59 - 64   2006.2

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    High resolution X-ray structure analyses revealed the condition for the charge ordering (CO) observed in the quasi one-dimensional compounds (TMTTF) &lt;SUB&gt;2&lt;/SUB&gt;X. The size and orientational ordering of the counter anion X control the dimerization and tetramerization of TMTTF molecules. The molecular dimerization suppresses the 4&lt;I&gt;k&lt;/I&gt;F CO, while the tetramerization assists the 2&lt;I&gt;k&lt;/I&gt;F CO. The phase diagram of the electronic states including 2&lt;I&gt;k&lt;/I&gt;F and 4&lt;I&gt;k&lt;/I&gt;F CO has been proposed associated with magnitudes of the molecular dimerization and tetramerization.

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  • X-ray Diffuse Scattering Study of Modulated Structure in θ-(BEDT-TTF)2CsM'(SCN)4 Under Electric Field

    Y. Nogami, Masashi Watanabe, Naoshi Ikeda, T. Ito, K. Yamamoto, Yukio Noda, I. Terasaki, H. Mori, T. Mori

    SPring-8 User Experiment Reports 2005A   2006

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  • Structure Analysis of Topological Crystal using Synchrotron Radiation

    Y. Nogami, T. Tsuneta, K. Yamamoto, N. Ikeda, T. Ito, N. Irie, S. Tanda

    Topology in Ordered Phase (World Scientific)   52-57   2006

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  • Diffuse Scattering in θ-(BEDT-TTF)2CsZn(SCN)4 under Electric Field at Low temperature

    N. Ikeda, M. Watanabe, T. Ito, Y. Nogami, S. Komiyama, Y. Noda, I. Terasaki, H. Mori, T. Mori

    SPring-8 User Experiment Report   14   301 - 301   2005

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  • Decrease in X-ray diffuse scattering intensity reflecting two-fold structural modulation in θ-(BEDT-TTF)2CsZn(SCN)4 under Electric Field

    Y. Nogami, M. Watanabe, N. Ikeda, T. Ito, K. Yamamoto, Y. Noda, I. Terasaki, H. Mori, T. Mori

    SPring-8 User Experiment Report   15   18 - 18   2005

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  • Crystal Structure of Charge Ordered Compound θ-(BEDT-TTF)2RbCo(SCN)4 at Low Temperatures

    M. Watanabe, Y. Noda, Y. Nogami, H. Mori

    Journal of the Physical Society of Japan   74 ( 7 )   2011 - 2016   2005

  • Spin-Peierls structural dimerization in [NiBr(chxn)2]Br2 and [NiCl(Chxn)2]Cl2

    Nogami Y, Ono M, Matsuzaki H, Okamoto H

    Meeting Abstracts of the Physical Society of Japan   58 ( 0 )   2003

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  • Superstructure in Organic τ-Phase Conductors

    KONOIKE T., NOGAMI Y., YOSHINO H., PAPAVASSILIOU G.C., MURATA Keizo

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   683 - 683   2002.8

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  • 25aXJ-6 Low-temperature structure in m-MPYNN BF_41/3acetone

    Kambe T., Nogami Y., Oshima K., Fujita W., Awaga K.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   387 - 387   2002.3

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  • 24aXM-10 Superlattice formation in θ -(BEDT-TTF)2RbZn(SCN)4 under high pressure.

    Watanabe M., Noda Y., Nogami Y., Mori H.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   760 - 760   2002.3

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  • 27pXN-8 Structure and magnetism of polymer phase in TDAE-C_60

    Fujiwara M., Kambe T., Oshima K, Nogami Y., Gaaj S., Forro L.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   813 - 813   2002.3

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  • 27pXM-1 Superstructure and magnetoresistance in (DMET-TSeF)_2 Au(CN)_2

    Oshima K., Kambe T., Nogami Y., Kato K., Sasaki T., Motokawa M., Kato R.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   808 - 808   2002.3

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  • 27pXM-4 Structure analyses of (TMTTF)2X at low temperature II

    Nogami Y., Nakamura. T.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   809 - 809   2002.3

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  • 24aXW-10 Effects of Tungsten doping on the electronic state in η-Mo_4O_<11>

    Nagao N., Tsuboi S., Kambe T., Nogami Y., Oshima K.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   724 - 724   2002.3

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  • ATOMIC SIZE EFFECT IN THE X-RAY-DIFFRACTION FOR PARTIALLY DISORDERED ONE-DIMENSIONAL MOLECULAR SUPERLATTICE

    K OGASAWARA, Y NOGAMI, T ISHIGURO

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   63 ( 11 )   4260 - 4261   1994.11

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  • ANOMALOUS X-RAY-DIFFRACTION LINE SHIFT IN HETEROGENEOUS LANGMUIR-BLODGETT MULTILAYER FILMS

    Y NOGAMI, H HAMANAKA, T ISHIGURO

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   60 ( 6 )   1860 - 1863   1991.6

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    The X-ray diffraction pattern of Langmuir-Blodgett films formed with alternately deposited Cd stearate and Cd behenate exhibits anomalous shifts in the diffraction angles when they have the deposition order with dimerized Cd layers. The magnitude of the reciprocal vector of the n-th order is represented by G(n) = nG(a) - (-1)(n)g(n), where G(a) is for averaged unit vector and g(n) is the shift that changes gradually with the index of diffraction and the multiplicity of the layers.

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  • 30a-JF-12 重水素化したα-(BEDT-TTF)_2I_3の構造変化(分子性結晶・液晶・有機半導体)

    野上 由夫, 鹿児島 誠一, 浦山 初果, 斉藤 軍治, 菅野 忠

    年会講演予稿集   42 ( 2 )   325 - 325   1987.3

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  • X線単色ラウエ法

    野上 由夫, 久保 光一, 鹿児島 誠一

    固体物理   22 ( 3 )   p187 - 190   1987.3

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Presentations

  • トポロジカル半金属YPdxPt1-xBiの作成と電気物性

    近藤隆祐, 石井宏樹, 野上由夫

    日本物理学会 第73回年次大会  日本物理学会

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    Event date: 2018.3.22 - 2018.3.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京理科大学  

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  • 希土類低次元伝導体YNiC2 の超格子構造

    野上由夫, 近藤隆祐, 小林賢介, 熊井玲児

    日本物理学会 第72回年次大会  日本物理学会

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    Event date: 2017.3.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪大学豊中キャンパス  

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  • 低温強磁場X線カメラの開発と希土類化合物RNiC2系への適用

    近藤隆祐, 阿井幸男, 野上由夫

    日本物理学会 2016年秋季大会  日本物理学会

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    Event date: 2016.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学  

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  • 希土類化合物RNiC2(R=La,Ce)のホール効果2

    野村勝史,近藤隆祐,野上由夫

    日本物理学会第70回年次大会  日本物理学会

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    Event date: 2015.3.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学  

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  • パイロクロア型ニオブ酸化物におけるNb四面体の電荷クラスター状態の探索

    鳥越秀平,青石優平,村川寛,松村大樹,吉井賢資,米田安宏,樹神克明,池田一貴,大友季哉,富安啓輔,中尾裕則,野上由夫,花咲徳亮

    日本物理学会第70回年次大会  日本物理学会

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    Event date: 2015.3.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学  

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  • 希土類化合物RTC2(R=Y,Dy;T=Ni,Co)における磁気秩序とCDWの相互作用

    前田浩之,近藤隆祐,野上由夫

    日本物理学会  日本物理学会

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    Event date: 2013.9.25 - 2013.9.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学  

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  • 一軸性圧力によるモット絶縁体Ca2RuO4の金属化 磁性と面内異方性

    谷口晴香,西村佳悟,米澤進吾,中村文彦,近藤隆祐,野上由夫,前野悦輝

    日本物理学会  日本物理学会

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    Event date: 2013.9.25 - 2013.9.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学  

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  • θ-(BEDT-TTF)2(Rb1-xCsx)Zn(SCN)4混晶試料の交流インピーダンス測定

    岡部翔太,近藤隆祐,野上由夫

    日本物理学会  日本物理学会

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    Event date: 2013.9.25 - 2013.9.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学  

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  • 希土類化合物RNiC2の単結晶作成と物性測定

    前田浩之,山本伸樹,近藤隆祐,野上由夫

    希土類化合物RNiC2の単結晶作成と物性測定  日本物理学会

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    Event date: 2013.3.26 - 2013.3.29

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学  

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  • 有機伝導体の競合する電荷秩序の変化と電流による融解

    野上由夫

    IGERセミナー「強相関電子系の非線形伝導」  名古屋大学理学部

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    Event date: 2013.3.14

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学理学部  

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  • (TMTTF)2Brの低温構造

    戸田敦基,近藤隆祐,野上由夫,中尾朗子,熊井玲児

    物構研サイエンスフェスタ  物構研

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    Event date: 2013.3.12 - 2013.3.14

    Language:Japanese   Presentation type:Poster presentation  

    Venue:つくば国際会議場  

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  • 非対称な軸配位子をもった鉄フタロシアニンの構造と物性

    濱田佑美、大石寛子、松田真生、花咲徳亮、野上由夫

    分子科学討論会  日本化学会

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    Event date: 2012.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京大学  

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  • θ-(BEDT-TTF)2(Rb1-xCsx)Zn(SCN)4混晶試料の構造と物性

    岡部翔太,野上由夫,近藤隆祐

    日本物理学会秋季大会  日本物理学会

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    Event date: 2012.9.18 - 2012.9.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜国立大学  

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  • マグネトプランバイト型バナジウム酸化物Li2AV10.5O19(A=Na,K)の伝導特性

    徳山達郎,野上由夫,小池正義,花咲徳亮

    日本物理学会秋季大会  第67回年次大会

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    Event date: 2012.9.18 - 2012.9.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜国立大学  

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  • TbNiC2のX線磁気散乱

    下村晋,中尾裕則,山本伸樹,野上由夫,花咲徳亮,小坂昌史,小野寺秀也

    日本物理学会秋季大会  日本物理学会

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    Event date: 2012.9.18 - 2012.9.21

    Language:Japanese   Presentation type:Poster presentation  

    Venue:横浜国立大学  

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  • 軸配位金属フタロシアニン系への非対称性導入

    大石寛子、松田真生、野上由夫、花咲徳亮

    日本化学会 

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    Event date: 2012.3.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:慶応義塾大学  

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  • 量子スピン液体κ‐(BEDT-TTF)2Cu2(CN)3の低温対称性変化の観測

    山本伸樹,野上由夫,近藤隆祐,寺崎一郎,佐々木孝彦,前里光彦,花咲徳亮,中尾朗子

    日本物理学会第67回年次大会  日本物理学会

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    Event date: 2012.3.24 - 2012.3.27

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:関西学院大学  

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  • RNiC2 (R = Tb, Gd) の放射光X線回折

    下村晋,野上由夫,花咲徳亮,山本伸樹,中尾裕則,中尾朗子,小坂昌史,小野寺秀也

    日本物理学会第67回年次大会  日本物理学会

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    Event date: 2012.3.24 - 2012.3.27

    Language:Japanese   Presentation type:Poster presentation  

    Venue:関西学院大学  

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  • NdNiC2単結晶による電荷密度波の観測と磁気抵抗

    松本昇紘,山本伸樹,野上由夫,近藤隆祐,花咲徳亮,下村晋

    日本物理学会第67回年次大会  日本物理学会

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    Event date: 2012.3.24 - 2012.3.27

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:関西学院大学  

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  • 新散漫散乱カメラによる(TMTSF)2PF6のSDW転移に先立つCDWゆらぎの観測

    戸田敦基,山本伸樹,野上由夫,近藤隆祐,花咲徳亮

    日本物理学会第67回年次大会  第67回年次大会

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    Event date: 2012.3.24 - 2012.3.27

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:関西学院大学  

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  • θ-(BEDT-TTF)2CsZn(SCN)4の一軸圧縮下の変調波数と物性

    野上由夫,谷本由衣,近藤隆祐,花咲徳亮

    日本物理学会 

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    Event date: 2012.3.24 - 2012.3.27

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:関西学院大学  

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  • DyNiC2およびCeNiC2単結晶による電荷密度波の観測と磁気抵抗

    前田浩之,山本伸樹,野上由夫,近藤隆祐,花咲徳亮,下村晋

    日本物理学会第67回年次大会  日本物理学会

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    Event date: 2012.3.24 - 2012.3.27

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:関西学院大学  

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  • パイロクロア型ニオブ酸化物における幾何学的電荷フラストレーション

    鳥越秀平, 花咲徳亮, 野上由夫, 松村大樹, 吉井賢資, 米田安宏, 西畑保雄

    日本物理学会 

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    Event date: 2011.9.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学  

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  • 巨大磁気抵抗を示すフタロシアニン分子系伝導体における電荷秩序の磁場中融解

    花咲徳亮, 立石拓麻, 野上由夫, 松田真生, 田島裕之, 瀧川仁, 内藤俊雄, 稲辺保

    日本物理学会 

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    Event date: 2011.9.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学  

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  • 反転対称のない超伝導体LaNiC2の元素置換効果と周辺の電荷密度波

    野上由夫,花咲徳亮

    新学術領域「トポロジカル量子現象」第6回集中連携研究会  新学術領域「トポロジカル量子現象」

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    Event date: 2011.7.25 - 2011.7.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪大学  

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  • 六方晶バナジウム酸化物の水熱合成

    徳山達郎, 奥迫俊樹, 三上和幸, 野上由夫, 花咲徳亮

    日本物理学会 

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    Event date: 2011.3.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟大学  

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  • 希土類化合物GdNiC2の磁場中相図

    三上和幸, 花咲徳亮, 横田研太郎, 野上由夫, 下村晋, 小坂昌史, 小野寺秀也

    日本物理学会 

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    Event date: 2011.3.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟大学  

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  • 巨大磁気抵抗を示すフタロシアニン分子系伝導体における電荷秩序の磁場中融解

    立石拓麻, 花咲徳亮, 野上由夫, 松田真生, 田島裕之, 瀧川仁, 内藤俊雄, 稲辺保

    日本物理学会 

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    Event date: 2011.3.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟大学  

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  • GdNiC2の変調構造と逐次相転移

    下村晋, 野上由夫, 花咲徳亮, 横田研太郎, 中尾裕則, 中尾朗子, 小坂昌史, 小野寺秀也

    日本物理学会 

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    Event date: 2011.3.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟大学  

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  • (TMTCF)2XのCDW/COのX線放射光観察1

    野上由夫,戸田 敦基,近藤隆祐,花咲徳亮,神戸 高志,中尾朗子

    日本物理学会 

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    Event date: 2011.3.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟大学  

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  • X-ray Absorption Spectra in Pyrochlore Niobates International conference

    S.Torigoe, N.Hanasaki, Y.Nogami, D.Matsumura, K.Yoshii, Y.Yoneda, and Y.Nishihata

    International Conference on Frustration in Condensed Matter 

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    Event date: 2011.1.11 - 2011.1.14

    Language:English   Presentation type:Poster presentation  

    Venue:Sendai international center  

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  • Hydrothermal Synthesis of Hexagonal Vanadium Oxide International conference

    T.Tokuyama, T.Okusako, K.Mikamai, N.Hanasaki, and Y.Nogami

    International Conference on Frustration in Condensed Matter 

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    Event date: 2011.1.11 - 2011.1.14

    Language:English   Presentation type:Poster presentation  

    Venue:Sendai international center  

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  • Succesive Transition in Rare-Earth Interemetallic Compound GdNiC2 International conference

    N.Hanasaki, K.Mikami, Y.Nogami, S.Shimomura, M.Kosaka, and H.Onodera

    International Conference on Frustration in Condensed Matter 

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    Event date: 2011.1.11 - 2011.1.14

    Language:English   Presentation type:Poster presentation  

    Venue:Sendai international center  

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  • Development of highly sensitive X-ray camera under Magnetic field and its application to the low-dimensional quantum-spin system CuGe1-xSixO3 International conference

    Y. Zhang, Morigensudu, N. Hanasaki and Y. Nogami

    The 11th Asia Pacific Physics Conference  Asia Pacific Physical Society

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    Event date: 2010.11.14 - 2010.11.18

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Shanghai, China  

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  • 擬三角格子における外場敏感な変調構造競合

    野上由夫,花咲徳亮

    フラストレーション特定領域トピカルミーティング  特定領域研究フラストレーション

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    Event date: 2010.10.15 - 2010.10.16

    Language:Japanese   Presentation type:Poster presentation  

    Venue:宮島  

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  • パイロクロア型Nb酸化物におけるX線吸収スペクトルと強誘電性

    鳥越秀平,奈良晋太郎,花咲徳亮,野上由夫,松村大樹,吉井賢資,米田安宏

    日本物理学会2010年秋季大会  日本物理学会

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    Event date: 2010.9.23 - 2010.9.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪府立大学  

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  • 希土類化合物GdNiC2の磁場中相図

    三上和幸,花咲徳亮,横田研太郎,野上由夫,下村晋,小坂昌史,小野寺秀也

    日本物理学会2010年秋季大会  日本物理学会

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    Event date: 2010.9.23 - 2010.9.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪府立大学  

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  • θ-(BEDT-TTF)2RbZn(SCN)4の超急冷後の低温電荷秩序構造と非線形伝導

    野上由夫,小椋美鈴,松家卓也,花咲徳亮,渡邉真史,野田幸男,寺崎一郎,森初果,森健彦

    日本物理学会第65回年次大会 

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    Event date: 2010.3.20 - 2010.3.23

    Presentation type:Oral presentation (general)  

    Venue:岡山大学  

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  • 希土類化合物RNiC2の磁気抵抗

    花咲徳亮,野上由夫,横田研太郎,三上和幸,柿沼光之,下村晋,小坂昌史,小野寺秀也

    日本物理学会第65回年次大会 

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    Event date: 2010.3.20 - 2010.3.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山大学  

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  • SiドープしたCuGeO3の極低温精密X線変調構造測定

    張宇,花咲徳亮,野上由夫,モリギンスド,松家卓也

    日本物理学会第65回年次大会 

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    Event date: 2010.3.20 - 2010.3.23

    Presentation type:Oral presentation (general)  

    Venue:岡山大学  

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  • 有機サイリスタを巡る話

    野上由夫

    特定領域研究フラストレーション班会議  特定領域研究フラストレーション

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    Event date: 2009.10.14

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都  

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  • RENiC2の低温磁場下構造測定

    横田研太郎,花咲徳亮,*野上由夫,下村晋,小野寺秀也

    日本物理学会2009秋季大会 

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    Event date: 2009.9.25 - 2009.9.28

    Presentation type:Oral presentation (general)  

    Venue:熊本市  

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  • β"-(BEDT-TTF)(TCNQ)の低温超格子構造

    小椋美鈴,花咲徳亮,*野上由夫,薬師久弥,山本浩史,加藤礼三

    日本物理学会2009秋季大会 

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    Event date: 2009.9.25 - 2009.9.28

    Presentation type:Oral presentation (general)  

    Venue:熊本市  

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  • フタロシアニン分子系伝導体TPP[Fe(Pc)(CN)2]2の強磁場下磁化測定

    立石拓麻,花咲徳亮,*野上由夫,徳永将史,松田真生,田島裕之,内藤俊雄,稲辺保

    日本物理学会2009秋季大会 

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    Event date: 2009.9.25 - 2009.9.28

    Presentation type:Oral presentation (general)  

    Venue:熊本市  

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  • 六方晶タングステン酸化物の輸送特性

    奥迫俊樹,花咲徳亮,*野上由夫

    日本物理学会2009秋季大会 

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    Event date: 2009.9.25 - 2009.9.28

    Presentation type:Poster presentation  

    Venue:熊本市  

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  • X-ray diffraction in molecular conductor TPP[Fe(Pc)(CN)2]2 International conference

    T. Tateishi, N. Hanasaki, M. Tanabe, *Y. Nogami, M. Matsuda H. Tajima, T. Naito, and T. Inabe

    8th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets 

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    Event date: 2009.9.12 - 2009.9.17

    Presentation type:Poster presentation  

    Venue:Niseko  

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  • X-ray Modulation Structural Study of RENiC2 under High Magnetic Field International conference

    K. Yokota, M. Kakinuma, N. Hanasaki, T. Kambe, N. Ikeda, *Y. Nogami, S. Shimomura, E. Ohmichi, and H. Onodera

    8th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets 

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    Event date: 2009.9.12 - 2009.9.17

    Presentation type:Poster presentation  

    Venue:Niseko  

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  • Nonequilibrium Charge Ordering in θ-(BEDT-TTF)2MZn(SCN)4 (M=Cs, Rb; M=Co, Zn) International conference

    I. Terasaki, S. Tasaki, *Y. Nogami, M. Watanabe, H. Mori and T. Mori

    8th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets 

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    Event date: 2009.9.12 - 2009.9.17

    Presentation type:Oral presentation (general)  

    Venue:Niseko  

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  • Low Temperature Super-lattice Structure in β”-(BEDT-TTF)(TCNQ) International conference

    M. Ogura, N. Hanasaki, *Y. Nogami, K. Yakushi, H. M. Yamamoto, and R. Kato

    8th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets 

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    Event date: 2009.9.12 - 2009.9.17

    Presentation type:Poster presentation  

    Venue:Niseko  

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  • Pressure Effect on the Competing Charge Ordered States in θ-(BEDT-TTF)2CsZn(SCN)4 International conference

    M. Watanabe, M. Osanai, Y. Dohi, Y. Noda, Y. Nogami, I. Terasaki, H. Mori, and T. Mori

    8th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets 

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    Event date: 2009.9.12 - 2009.9.17

    Presentation type:Poster presentation  

    Venue:Niseko  

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  • Competition of Two Charge Ordering Domains in θ-(BEDT-TTF)2RbZn(SCN)4 International conference

    *Y. Nogami, N. Hanasaki, N. Ikeda, T. Kambe, M. Watanabe, Y. Noda, K. Yamamoto H. Toyokawa, H. Ohsumi, I. Terasaki, H. Mori, and T. Mori

    8th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets 

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    Event date: 2009.9.12 - 2009.9.17

    Presentation type:Oral presentation (general)  

    Venue:Niseko  

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  • θ-(BEDT-TTF)2MZn(SCN)4 (M=Cs,Rb)の非線形誘電率と電荷秩序ギャップ

    寺崎一郎,稲田太一,田崎秀一,野上由夫,渡邉真史,森初果,森健彦

    日本物理学会第64回年次大会 

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    Event date: 2009.3.27 - 2009.3.30

    Presentation type:Oral presentation (general)  

    Venue:東京都豊島区  

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  • RENiC2の磁場中構造測定

    柿沼光之,花咲徳亮,*野上由夫,下村晋,小野寺秀也

    日本物理学会第64回年次大会 

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    Event date: 2009.3.27 - 2009.3.30

    Presentation type:Oral presentation (general)  

    Venue:東京都豊島区  

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  • θ-(BEDT-TTF)2MZn(SCN)4 (M=Cs,Rb)の低温電荷秩序構造

    *野上由夫,山本健一郎,柿沼光之,小椋美鈴,横田研太郎,花咲徳亮,池田直,神戸高志,張宇,眞苅伸明,立石拓麻,渡邉真史,小山内雅人,野田幸男,寺崎一郎,稲田太一,大西祐也他5名

    日本物理学会第64回年次大会 

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    Event date: 2009.3.27 - 2009.3.30

    Presentation type:Oral presentation (general)  

    Venue:東京都豊島区  

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  • 時間分割2次元ディテクタPILATUSによる有機サイリスタの電流効果と時間変化

    *野上由夫 寺崎一郎

    第12回SPring-8シンポジウム 

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    Event date: 2008.10.30 - 2008.11.1

    Presentation type:Poster presentation  

    Venue:東京  

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  • θ-(BEDT-TTF)2RbZn(SCN)4の急冷・非線形伝導状態における電荷秩序競合と格子の変調

    渡邉真史,山本健一郎A,柿沼光之A,*野上由夫A,B,花咲徳亮A,池田直A,神戸高志A,横田研太郎A,伊藤崇芳C,豊川秀訓D,大隅寛幸D,小山内雅人E,野田幸男E,稲田太一F,寺崎一郎F,森初果B,G,森健彦H

    日本物理学会2008年秋季大会 

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    Event date: 2008.9.22

    Presentation type:Oral presentation (general)  

    Venue:岩手県盛岡市  

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  • 高圧下のθ-(BEDT-TTF)2CsZn(SCN)4における電荷秩序相と構造変調

    小山内雅人,渡邉真史A,野田幸男B,*野上由夫C,D,寺崎一郎E,森初果D,F,森健彦G

    日本物理学会2008年秋季大会 

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    Event date: 2008.9.22

    Presentation type:Oral presentation (general)  

    Venue:岩手県盛岡市  

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  • フタロシアニン分子系伝導体TPP[Fe(Pc)(CN)2]2の光電子分光

    花咲徳亮,田邉誠,脇田高徳,村岡祐司,横谷尚睦,*野上由夫,松田真生A,田島裕之A,武次徹也B,稲辺保B

    日本物理学会2008年秋季大会 

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    Event date: 2008.9.21

    Presentation type:Oral presentation (general)  

    Venue:岩手県盛岡市  

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  • NbSe3トポロジカル結晶におけるフラストレーション緩和

    常田琢,山本健一郎A,池田直A,*野上由夫A,丹田聡B

    日本物理学会2008年秋季大会 

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    Event date: 2008.9.20

    Presentation type:Oral presentation (general)  

    Venue:岩手県盛岡市  

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  • Current Effect on Structural Property of Organic Thyristor International conference

    *Yoshio Nogami

    第21回国際結晶学連合会議(IUCr2008)サテライト会議 国際結晶学連合会議(IUCr2008) 

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    Event date: 2008.8.21 - 2008.8.22

    Presentation type:Oral presentation (general)  

    Venue:大阪府千里市  

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  • θ-(BEDT-TTF)2MM'(SCN)4; (M=Cs,Rb, M'=Zn,Co)の電荷秩序 と構造変調

    渡邉真史、野田幸男,*野上由夫他

    ISSP ワークショップ:分子性導体の電荷揺らぎと非線形伝導 

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    Event date: 2008.5.21

    Presentation type:Oral presentation (general)  

    Venue:千葉県柏市  

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  • θ-(BEDT-TTF)2RbZn(SCN)4 の電荷秩序競合と 電子輸送

    山本健一郎、*野上由夫

    ISSP ワークショップ:分子性導体の電荷揺らぎと非線形伝導 

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    Event date: 2008.5.21

    Presentation type:Oral presentation (general)  

    Venue:千葉県柏市  

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  • β”-(BEDT-TTF)2AuBr2の低温超格子測定

    柿沼光之,花咲徳亮,野上由夫,近藤隆祐A,鹿児島誠一A

    日本物理学会第63回年次大会 

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    Event date: 2008.3.26

    Presentation type:Oral presentation (general)  

    Venue:大阪府  

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  • β''-(BEDT-TTF)2AuBr2の圧縮下電子物性

    近藤隆祐,鹿児島誠一,柿沼光之A,花咲徳亮A,野上由夫A

    日本物理学会第63回年次大会 

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    Event date: 2008.3.26

    Presentation type:Oral presentation (general)  

    Venue:大阪府  

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  • θ-(BEDT-TTF)2CsZn(SCN)4における超格子の圧力変化

    渡邉真史,小山内雅人,野田幸男,*野上由夫A,B,寺崎一郎C,森初果D,森健彦E

    日本物理学会第63回年次大会 

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    Event date: 2008.3.24

    Presentation type:Oral presentation (general)  

    Venue:大阪府  

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  • θ-(BEDT-TTF)2RbZn(SCN)4の超急冷相での変調構造

    山本健一郎,花咲徳亮,野上由夫,柿沼光之,横田研太郎,池田直,神戸高志,渡邉真史A,野田幸男A,寺崎一郎B,稲田太一B,森初果C,森健彦D,伊藤崇芳E,豊川秀訓E,大隅寛幸E

    日本物理学会第63回年次大会 

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    Event date: 2008.3.24

    Presentation type:Oral presentation (general)  

    Venue:大阪府  

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  • o-TaS3における電場誘起ディスコメンシュレーション

    稲垣克彦,坪田雅功,東山和樹,市村晃一,丹田聡,山本健一郎A,花咲徳亮A,池田直A,*野上由夫A,伊藤崇芳B,豊川秀訓B

    日本物理学会第63回年次大会 

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    Event date: 2008.3.23

    Presentation type:Oral presentation (general)  

    Venue:大阪府  

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  • フタロシアニン分子系伝導体TPP[Fe(Pc)(CN)2]2の散漫散乱

    花咲徳亮,田邉誠,山本健一郎,*野上由夫,池田直,松田真生A,田島裕之A,瀧川仁A,稲辺保B

    日本物理学会第63回年次大会 

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    Event date: 2008.3.23

    Presentation type:Oral presentation (general)  

    Venue:大阪府  

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  • 強電場強磁場下のX 線回折

    *野上由夫

    特定領域研究「新しい環境下における分子性導体の特異な機能の探索」第8回シンポジウム 

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    Event date: 2008.1.7 - 2008.1.9

    Presentation type:Oral presentation (general)  

    Venue:東京都目黒区  

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  • Generalized Method of Structural Analysis for Micro Imperfect Crystals using SR International conference

    K. Yamamoto, Y. Nogami他

    Asian Crystallographic Association 2007 

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    Event date: 2007.11.4 - 2007.11.7

    Presentation type:Poster presentation  

    Venue:Taipei/Taiwan  

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  • 非線形伝導を示す有機伝導体の電流下構造変化

    *野上由夫

    第57回錯体化学討論会シンポジウム 

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    Event date: 2007.9.25

    Presentation type:Oral presentation (general)  

    Venue:名古屋市  

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  • θ-(BEDT-TTF)2CsM(SCN)4における電流密度に依存するエネルギーギャップ

    寺崎一郎,澤野文章,須子友博,田崎秀一,森初果A,B,森健彦C,*野上由夫B,D,池田直D,渡邉真史E,野田幸男E,

    日本物理学会第62回年次大会 

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    Event date: 2007.9.21

    Presentation type:Oral presentation (general)  

    Venue:北海道札幌市  

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  • 時間分割2次元ディテクタを用いたθ-(BEDT-TTF)2CsZn(SCN)4の電流下X線回折実験

    渡邉真史,山本健一郎A,伊藤崇芳B,花咲徳亮A,池田直A,*野上由夫A,C,豊川秀訓B,野田幸男,稲田太一D,須子友博D,寺崎一郎D,森初果C,E,森健彦F

    日本物理学会第62回年次大会 

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    Event date: 2007.9.21

    Presentation type:Oral presentation (general)  

    Venue:北海道札幌市  

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  • 磁場中高感度X 線カメラの製作と物性研究への応用

    *野上由夫

    特定領域研究「新しい環境下における分子性導体の特異な機能の探索」第7回シンポジウム 

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    Event date: 2007.7.19 - 2007.7.20

    Presentation type:Poster presentation  

    Venue:東京都文京区  

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  • theta-(BEDT-TTF)2Xにおける電荷秩序の電流融解と格子変化

    *野上由夫

    SPring-8「分子性導体の機能・構造相関の研究と放射光利用」研究会 

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    Event date: 2007.6.2 - 2007.6.4

    Presentation type:Oral presentation (general)  

    Venue:兵庫県  

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  • θ-(BEDT-TTF)2CsZn(SCN)4の非線形伝導と巨大格子変形

    渡邉真史,山本健一郎A,中島悠策A,伊藤崇芳B,田辺誠A,花咲徳亮A,池田直A,*野上由夫A,C,豊川秀訓B,野田幸男,寺崎一郎D,澤野文章D,須子友博D,森初果C,E,森健彦F

    日本物理学会2007年春季大会 

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    Event date: 2007.3.21

    Presentation type:Oral presentation (general)  

    Venue:鹿児島県鹿児島市  

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  • θ-(BEDT-TTF)2RbZn(SCN)4の結晶格子の温度変化とスピンパイエルス転移

    渡邉真史,*野上由夫A,B,野田幸男,森初果B,C

    日本物理学会2007年春季大会 

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    Event date: 2007.3.21

    Presentation type:Oral presentation (general)  

    Venue:鹿児島県鹿児島市  

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  • TMTTF2Xの低温構造6

    *野上由夫,伊藤崇芳A,山本健一郎,中村敏和B

    日本物理学会2007年春季大会 

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    Event date: 2007.3.19

    Presentation type:Oral presentation (general)  

    Venue:鹿児島県鹿児島市  

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  • TMTSF2Xの低温構造1

    中島悠策,*野上由夫A,神戸高志,大嶋孝吉

    日本物理学会2007年春季大会 

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    Event date: 2007.3.19

    Presentation type:Oral presentation (general)  

    Venue:鹿児島県鹿児島市  

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  • 放射光を用いたTaSe3トポロジカル結晶の歪み解析

    山本健一郎A,松浦徹B,丹田聡B,伊藤崇芳A,堀田慎太郎A,池田直D,*野上由夫A,C

    日本物理学会2007年春季大会 

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    Event date: 2007.3.18

    Presentation type:Oral presentation (general)  

    Venue:鹿児島県鹿児島市  

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  • θ系BEDT-TTF錯体に於ける電荷秩序とX線回折

    *野上由夫

    特定領域研究「新しい環境下における分子性導体の特異な機能の探索」強磁場有機研究会 

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    Event date: 2006.10.31 - 2006.11.1

    Venue:宮城県仙台市  

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  • 強磁場下高感度X線回折装置を目指して

    *野上由夫

    特定領域研究「新しい環境下における分子性導体の特異な機能の探索」強磁場有機研究会 

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    Event date: 2006.10.31 - 2006.11.1

    Venue:宮城県仙台市  

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  • 非線形電気伝導状態におけるθ-(BEDT-TTF)2CsZn(SCN)4 の格子変形

    渡邉真史, 伊藤崇芳, 山本健一郎, 中島悠策, 花咲徳亮, 池田直,*野上由夫, 大隅寛幸, 豊川秀訓, 野田幸男, 寺崎一郎, 澤野文章, 須子友博, 森初果, 森健彦

    日本物理学会2006年秋季大会 

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    Event date: 2006.9.23 - 2006.9.26

    Venue:千葉県千葉市  

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  • Low temperature Structural Study of a-(BEDT-TTF)2MHg(SCN)4 [M=K and Rb]

    Takayoshi Ito, Naoaki Irie, *Yoshio Nogami and Hatumi Mori

    International conference on technology and science of synthetic metals 2006(ICSM2006) 

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    Event date: 2006.7.8

    Venue:Dublin Ireland  

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  • X-ray diffraction for θ-(BEDT-TTF)2CsZn(SCN)4 in electric field- Current Effect on the Charge Disproportionation -

    M. Watanabe, T. Ito, K.-i. Yamamoto, N. Ikeda, Y. Nogami, H. Toyokawa, H. Ohsumi, Y. Nakashima, S. Horita, Y. Noda, I. Terasaki, F. Sawano, H. Mori and T. Mori

    International conference on technology and science of synthetic metals 2006(ICSM2006) 

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    Event date: 2006.7.6

    Venue:Dublin Ireland  

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  • Observation of Spin-Peierls Modulation in (TMTTF)2AsF6 by Synchrotron Radiation

    T. Ito, K. Yamamoto, *Y. Nogami, S. Horita, N. Ikeda and T. Nakamura

    International conference on technology and science of synthetic metals 2006(ICSM2006) 

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    Event date: 2006.7.5

    Venue:Dublin Ireland  

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  • Synchrotron radiation diffraction of CDW state in a ring shaped crystal

    K. Yamamoto, T. Ito, N. Ikeda, *Y. Nogami, S. Horita, S. Tanda, T. Matsuura, T. Tsuneta

    International conference on technology and science of synthetic metals 2006(ICSM2006) 

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    Event date: 2006.7.5

    Venue:Dublin Ireland  

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  • 低次元物質と遷移金属酸化物における電荷秩序

    *野上由夫 池田 直

    北海道大学21世紀COEプログラム「トポロジー理工学の創成」エンレイソウの会 

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    Event date: 2006.6.8

    Venue:北海道札幌市  

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  • 2005-2006の活動報告

    *野上由夫

    特定領域研究「新しい環境下における分子 性導体の特異な機能の探索」第三班 班会議 

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    Event date: 2006.6.2

    Venue:愛知県名古屋市  

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  • 低温強磁場散漫散乱カメラの開発

    堀田真太郎, 伊藤崇芳, 入江直明, 池田直, *野上由夫, 長尾暢顕, 神戸高志, 大嶋孝吉, 磯部正彦, 上田寛

    日本物理学会第61回年次大会 

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    Event date: 2006.3.29

    Venue:愛媛県松山市  

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  • (DMET)2BF4および(DMET)2PF6の低温結晶構造

    菅野奈緒子,*野上由夫,菊地耕一,西川 浩之

    日本物理学会第61回年次大会 

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    Event date: 2006.3.28

    Venue:愛媛県松山市  

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  • θ-(BEDT-TTF)2CsM'(SCN)4の放射光を用いたパルス電流下変調構造測定

    渡邉真史, 伊藤崇芳, 池田直, 山本健一郎, 豊川秀訓,大隅寛幸,中島悠策, 堀田真太郎, *野上由夫, 野田幸男, 寺崎一郎, 澤野文章, 森初果, 森健彦

    日本物理学会第61回年次大会 

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    Event date: 2006.3.27

    Venue:愛媛県松山市  

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  • NbSe3リング結晶のCDW衛星反射測定

    山本健一郎, 伊藤崇芳, 池田直, *野上由夫 , 堀田真太郎 , 松浦徹,丹田聡 , 常田琢

    日本物理学会第61回年次大会 

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    Event date: 2006.3.27

    Venue:愛媛県松山市  

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  • M2P-TCNQF4の低温結晶構造

    伊藤崇芳, 山本健一郎, *野上由夫, 池田直, 松崎弘幸,岡本博

    日本物理学会第61回年次大会 

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    Event date: 2006.3.27

    Venue:愛媛県松山市  

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  • α-(BEDT-TTF)2MHg(SCN)4 (M=K,Rb)の結晶構造と変調構造

    入江直明, 伊藤崇芳, 山本健一郎, 野上由夫, 池田直

    日本物理学会第61回年次大会 

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    Event date: 2006.3.27

    Venue:愛媛県松山市  

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  • 変調構造の磁場および電場下構造測定

    *野上由夫 池田直

    特定領域研究「新しい環境下における分子性導体の特異な機能の探索」第4回シンポジウム 

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    Event date: 2006.1.9 - 2006.1.10

    Venue:東京都  

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  • X-ray Structural Study of Charge and Anion Orderings of TMTTF Salts.

    *Yoshio Nogami1,2 , Takayoshi Ito1, Kenichiro Yamamoto1, Naoaki Irie1, Shintaro Horita1, Takashi Kambe1, Nobuaki Nagao1, Kokichi Oshima1, Naoshi Ikeda3 and Toshikazu Nakamura4

    INTERNATIONAL WORKSHOP ON ELECTRONIC CRYSTALS ECRYS-2005 

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    Event date: 2005.8.21 - 2005.8.27

    Venue:Cargese, France  

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  • Structural Study of Charge Ordering and Anion Ordering of (TMTTF) 2X

    *Yoshio Nogami, Takayoshi Ito, Kenichiro Yamamoto, Naoaki Irie, Shintaro Horita, Takashi Kambe, Nobuaki Nagao, Kokichi Oshima, Naoshi Ikeda and Toshikazu Nakamura

    International Symposium on Molecular Conductors 

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    Event date: 2005.7.17 - 2005.7.21

    Venue:HAYAMA,KANAGAWA,JAPAN  

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  • Structural Modulation in θ-(BEDT-TTF)2CsZn(SCN)4 under Electric Field

    Masashi Watanabe, Takayoshi Ito, Kenichiro Yamamoto, Naoshi Ikeda, *Yoshio Nogami, Yukio Noda, Ichiro Terasaki, Hatsumi Mori and Takehiko Mori

    International Symposium on Molecular Conductors 

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    Event date: 2005.7.17 - 2005.7.21

    Venue:HAYAMA,KANAGAWA,JAPAN  

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  • 実験室系における強磁場低温高感度X線カメラの開発

    *野上由夫

    物性研究所短期研究会「ミクロプローブを用いた強磁場物性研究の展開?現状と将来?」 

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    Event date: 2005.6.14

    Venue:千葉県柏市  

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  • θ-(BEDT-TTF)2CsM'(SCN)4の低温電場下X線散乱 I

    渡邉真史,池田直,伊藤崇芳,*野上由夫,小宮山聰,野田幸男,寺崎一郎,森初果,森健彦

    日本物理学会2005年春季大会 

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    Event date: 2005.3.25

    Venue:千葉県野田市  

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  • (TMTTF)2Xの低温構造5

    *野上由夫,伊藤崇芳,池田直,中村敏和,山本健一郎,入江直明,堀田真太郎

    日本物理学会2005年春季大会 

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    Event date: 2005.3.24

    Venue:千葉県野田市  

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  • STRUCTURE ANALYSES OF TOPOLOGICAL CRYSTALS USING SYNCHROTRON RADIATION

    *Y. NOGAMI,1,2 T. TSUNETA, 3,4 K. YAMAMOTO,1 N. IKEDA,5 T. ITO,1 N. IRIE,1 AND S. TANDA3

    International Conference on "Topology in Orderd Phases"(TOP2005) 

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    Event date: 2005.3.8 - 2005.3.10

    Venue:Sapporo  

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  • DEVELOPMENT OF X-RAY ANALYSIS METHOD FOR TOPOLOGICAL CRYSTALS

    K. YAMAMOTO,T. ITO,N. IKEDA,S. HORITA,N. IRIE,*Y. NOGAMI,1,3 T. TSUNETA, 4,5 AND S. TANDA4

    International Conference on "Topology in Orderd Phases"(TOP2005) 

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    Event date: 2005.3.8 - 2005.3.10

    Venue:Sapporo  

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  • 極限環境下のX線回折

    *野上由夫

    特定領域研究「新しい環境下における分子 性導体の特異な機能の探索」第3回シンポジウム 

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    Event date: 2005.1.7 - 2005.1.8

    Venue:京都市  

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  • θ-(BEDT-TTF)2CsM'(SCN)4の変調構造の電流による変化

    渡邉真史,伊藤崇芳,山本健一郎,池田直,*野上由夫,野田幸男,寺崎一郎,森初果,森健彦

    日本物理学会2004年秋季大会 

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    Event date: 2004.9.19

    Venue:京都府京田辺市  

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  • X線回折で見たETと擬一次元系の電荷秩序

    *野上由夫

    特定領域研究「新しい環境下における分子性導体の特異な機能の探索」ワン・デイ・シンポジウム 

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    Event date: 2004.8.3

    Venue:東京都  

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  • Recent crystal structural investigations of (TMTTF)2X

    *Yoshio Nogami

    THE INTERNATIONAL CONFERENCE ON SYNTHETIC METALS 

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    Event date: 2004.6.28

    Venue:WOLLONGONG, AUSTRALIA  

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  • 低次元物質の構造研究の進展と強磁場極低温下広領域計測の試み

    *野上由夫

    特定領域研究「新しい環境下における分子性導体の特異な機能の探索」第2回シンポジウム 

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    Event date: 2004.6.19 - 2004.6.20

    Venue:東京都  

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  • Recent progress in low temperature structural study of (TMTTF)2X

    *Y. Nogami, N. Ikeda, T. Nakamura, T. Kambe, and K. Oshima

    特定領域研究「新しい環境下における分子性導体の特異な機能の探索」第1回シンポジウム 

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    Event date: 2004.1.19 - 2004.1.20

    Venue:東京都  

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  • (TMTTF)2Xの低温構造4

    *野上由夫,神戸高志,長尾暢顕,藤原基靖,大嶋孝吉,池田 直,中村敏和

    日本物理学会2003年秋季大会 

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    Event date: 2003.9.23

    Venue:岡山市  

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  • ハロゲン架橋一次元MX錯体[NiBr(chxn)2]Br2,[NiCl(chxn)2]Cl2のスピンパイエルス構造変調

    *野上由夫,小野円佳,松崎弘幸,岡本 博

    日本物理学会2003年秋季大会 

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    Event date: 2003.9.23

    Venue:岡山市  

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  • C60TDAEの低温における結晶構造II

    藤原基靖,神戸高志,*野上由夫,大嶋孝吉

    日本物理学会2003年秋季大会 

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    Event date: 2003.9.21

    Venue:岡山市  

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  • α'-(BEDT-TTF)2IBr2の低温精密構造

    *野上由夫,神戸高志,大嶋孝吉,斎藤軍治

    日本物理学会2003年秋季大会 

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    Event date: 2003.9.20

    Venue:岡山市  

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  • ZrTe3のCDW変調の低温X線観測

    *野上由夫,山谷和彦,丹田聡,稲垣克彦

    日本物理学会2003年秋季大会 

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    Event date: 2003.9.20

    Venue:岡山市  

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  • θ-BEDT-TTF2RbZn(SCN)4の高圧下・絶縁相における結晶構造

    渡邉真史,小宮山聰,野田幸男,*野上由夫,森初果,池田直

    日本物理学会第58回年次大会 

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    Event date: 2003.3.31

    Venue:仙台市  

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  • β’-CuxV2O5の変調構造のX線測定(X=0.29,0.39)

    長尾暢顕,*野上由夫,大嶋孝吉,山田浩之,上田寛

    日本物理学会第58回年次大会 

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    Event date: 2003.3.30

    Venue:仙台市  

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  • C60TDAEの低温における結晶構造

    藤原基靖,神戸高志,*野上由夫,大嶋孝吉

    日本物理学会第58回年次大会 

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    Event date: 2003.3.29

    Venue:仙台市  

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  • Cd2Re2O7の高Tc試料の構造

    神戸高志,*野上由夫,大嶋孝吉

    日本物理学会第58回年次大会 

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    Event date: 2003.3.29

    Venue:仙台市  

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  • (TMTTF)2Xの低温構造3

    *野上由夫,神戸高志,長尾暢顕,藤原基靖,大嶋孝吉,中村敏和,池田 直

    日本物理学会第58回年次大会 

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    Event date: 2003.3.28

    Venue:仙台市  

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  • τ型有機伝導体の超格子構造

    鴻池貴子,*野上由夫,吉野治一,G.C.Papavassiliou,村田惠三

    日本物理学会2002年秋季大会 

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    Event date: 2002.9.6

    Venue:名古屋市  

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  • The charge ordered state and the possible 2kF-CDW state with Fermi surface nesting in organic conductor q-BEDT-TTF)2MM'(SCN)4 (MM'=RbZn, CsCo).

    M.Watanabe, Y.Noda, *Y.Nogami K.Oshima and H.Mori

    INTERNATIONAL WORKSHOP ON ELECTRONIC CRYSTALS ECRYS-2002 

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    Event date: 2002.9.2 - 2002.9.7

    Venue:St. Flour, France  

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  • X-ray observation of 2kF and 4kF charge orderings in (TMTTF)2ReO4 and (TMTTF)2SCN associated with anion orderings

    *Y. Nogami and T. Nakamura

    INTERNATIONAL WORKSHOP ON ELECTRONIC CRYSTALS ECRYS-2002 

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    Event date: 2002.9.2 - 2002.9.7

    Venue:St. Flour, France  

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  • Unusual 2kF CDW state with enhanced charge ordering in β-(BEDT-TTF)2AsF6 and PF6

    *Y. Nogami and T. Mori

    INTERNATIONAL WORKSHOP ON ELECTRONIC CRYSTALS ECRYS-2002 

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    Event date: 2002.9.2 - 2002.9.7

    Venue:St. Flour, France  

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  • Effects of Tungsten doping on the CDW states of η-Mo4O11

    T. Kambe, S. Tsuboi, N. Nagao, *Y. Nogami, K. Oshima

    International conference on low temperature physics LT23 

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    Event date: 2002.8.20 - 2002.8.27

    Venue:広島  

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  • High field Fermi surfaces studied by AMRO in η-Mo4O11

    K. Oshima, T. Kambe, *Y. Nogami, T. Sasaki

    International conference on low temperature physics LT23 

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    Event date: 2002.8.20 - 2002.8.27

    Venue:広島  

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  • X-ray study of modulated structures of β-CuxV2O5 (x=0.29,0.39)

    N. Nagao, *Y. Nogami, K. Oshima, H. Yamada and Y. Ueda

    International conference on low temperature physics LT23 

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    Event date: 2002.8.20 - 2002.8.27

    Venue:広島  

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  • Shubnikov-de Haas Oscillations and Fermi Surface of τ-Phase Conductors

    T. Konoike, K. Iwashita, I. Nakano, H. Yoshino, T. Sasaki, *Y. Nogami, J. S. Brooks, D. Graf, C. H. Mielke, G. C. Papavassiliou, K. Murata

    International conference on low temperature physics LT23 

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    Event date: 2002.8.20 - 2002.8.27

    Venue:広島  

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  • Superlattice structural analysis of (TTM-TTP)I3 at low temperatures

    *Y. Nogami, T. Kambe, N. Fujimura, K. Oshima, T. Mori and T. Kawamoto

    International conference on science and technology of systhetic metals, ICSM2002 

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    Event date: 2002.6.29 - 2002.7.5

    Venue:Shanghai, China  

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  • Orientational ordering of distorted C60 in ferromagnetic TDAE-C60

    M. Fujiwara, T. Kambe, *Y. Nogami, K. Oshima

    International conference on science and technology of systhetic metals, ICSM2002 

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    Event date: 2002.6.29 - 2002.7.5

    Venue:Shanghai, China  

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  • Shubnikov-de Haas Oscillations and Low Temperature Electric Structure in τ-Phase Conductors

    T. Konoike, K. Iwashita, I. Nakano, H. Yoshino, T. Sasaki, T. Takahashi, *Y. Nogami, J. S. Brooks, D. Graf, C. H. Mielke, G. C. Papavassiliou, K. Murata

    International conference on science and technology of systhetic metals, ICSM2002 

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    Event date: 2002.6.29 - 2002.7.5

    Venue:Shanghai, China  

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  • Fermi surface and low temperature structure in (DMET-TSeF)2Au(CN)2

    K. Kato, K. Oshima, T. Kambe, *Y. Nogami, T. Sasaki, M. Motokawa and R. Kato

    International conference on science and technology of systhetic metals, ICSM2002 

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    Event date: 2002.6.29 - 2002.7.5

    Venue:Shanghai, China  

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  • TDAE-C60のポリマー相の磁性と構造

    藤原基靖,神戸高志,大嶋孝吉,*野上由夫,S. Garaj,L. Forro

    日本物理学会第57回年次大会 

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    Event date: 2002.3.24

    Venue:草津市  

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  • θ-(BEDT-TTF)2RbZn(SCN)4の高圧下での超格子の形成

    渡邉真史,望月桂介,前崎史朗,野田幸男,*野上由夫,森初果

    日本物理学会第57回年次大会 

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    Event date: 2002.3.24

    Venue:草津市  

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  • Charge ordering in organic compounds observed by X-ray.

    *Yoshio Nogami

    Internatinal Workshop on Control of Conduction Mechanism in Organic Conductors(ConCOM2002) 

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    Event date: 2002.1.27 - 2002.1.29

    Venue:神奈川県逗子市  

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  • θ-(BEDT-TTF)2Rb(SCN)4 (M=Zn,Co)の低温結晶構造

    渡邉真史,野田幸男,*野上由夫,森初果,田中昭二

    日本物理学会2001年秋季大会 

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    Event date: 2001.9.17

    Venue:徳島市  

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  • β-(BEDT-TTF)2PF6の電荷密度波変調のX線構造解析

    *野上由夫,森健彦,川本正

    日本物理学会2001年秋季大会 

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    Event date: 2001.9.17

    Venue:徳島市  

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  • (TTM-TTP)I3の低温変調構造解析

    *野上由夫,神戸高志,大嶋孝吉,森健彦,川本正

    日本物理学会2001年秋季大会 

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    Event date: 2001.9.17

    Venue:徳島市  

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  • (TMTTF)2Xの低温構造I

    *野上由夫,中村敏和

    日本物理学会2001年秋季大会 

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    Event date: 2001.9.17

    Venue:徳島市  

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  • (CHTM-TTP)2TCNQの低温超格子構造

    *野上由夫,大嶋孝吉,谷口 正輝A,御崎洋二,田中一義,中村敏和

    日本物理学会 第56回年次大会 

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    Event date: 2001.3.27

    Venue:立川市  

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  • (CHTM-TTP)2TCNQの磁気的性質

    中村敏和,谷口正輝,御崎洋二,田中一義,*野上由夫

    日本物理学会 第56回年次大会 

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    Event date: 2001.3.27

    Venue:立川市  

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  • Two incommensurate CDWs in low-dimensional conductor eta-Mo4O11.

    *Y. Nogami T. Kambe, N. Nagao, K. Oshima

    International Conference on Science and Technology of Synthetic Metals(ICSM2000) 

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    Event date: 2000.7.20

    Venue:Gastein Austria  

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  • Low temperature X-ray and ESR study of Quasi-1D DMTCA-BF4(C=S,Se) with half filled band.

    T. Kambe, N. Fujimura, *Y. Nogami, K. Oshima, K. Yakushi, J. Dong, K. Takimiya, T. Otsubo.

    International Conference on Science and Technology of Synthetic Metals(ICSM2000) 

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    Event date: 2000.7.18

    Venue:Gastein Austria  

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  • Relation between structural and electronic properties under physical or chemical pressure in organic solids

    *Y.Nogami

    International Workshop on Control of Conduction Mechanism in Organic Condoctors(ConCOM'99) 

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    Event date: 1999.11.22 - 1999.11.24

    Venue:Hajiouji  

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  • NaV2O5の低温構造の対称性

    長尾暢顕,*野上由夫,大嶋孝吉,磯部正彦,上田寛

    日本物理学会1999年秋の分科会 

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    Event date: 1999.9.25

    Venue:盛岡市  

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  • TDAE-C60の磁性と構造へのアニール効果

    神戸高志,*野上由夫,大嶋孝吉,開康一

    日本物理学会1999年秋の分科会 

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    Event date: 1999.9.24

    Venue:盛岡市  

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  • X-ray structural study of 4kF Wigner crystal and 4kF Peierls state in DCNQI complex with 1/4 filled quasi one-dimensional band

    *Y. Nogami, K. Oshima, K. Hiraki, K. Kanoda

    International Workshop on Electronic Crystals(ECRYS99) 

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    Event date: 1999.5.31 - 1999.6.5

    Venue:La Colle-sur-Loup  

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  • (DIDCNQI)2Agの4kF電荷変調と(DIDCNQI)2Cuの2kF格子歪

    *野上由夫

    物性研究所短期研究会「強相関電子系としての分子性導体」 

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    Event date: 1999.5.11

    Venue:東京  

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  • DMTSA-BF4のスピン磁化率の温度依存性

    難波淳,神戸高志,*野上由夫,大嶋孝吉,薬師久弥,薫健,瀧宮和男,大坪徹夫

    日本物理学会第54回年会 

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    Event date: 1999.3.31

    Venue:広島市  

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  • (XDCNQI)2Ag(X=DI,BrI,DM,DBr)の構造解析と低温超格子構造

    *野上由夫,山本裕子,大嶋孝吉,開康一,鹿野田一司

    日本物理学会第54回年会 

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    Event date: 1999.3.30

    Venue:広島市  

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  • ET,DCNQIの電荷状態(X線構造解析)

    *野上由夫

    ワークショップ「分子システムにおける価数不安定性と電荷秩序」 

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    Event date: 1999.1.29

    Venue:東京  

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