Updated on 2022/07/02

写真a

 
KAWASAKI Shinji
 
Organization
Faculty of Natural Science and Technology Associate Professor
Position
Associate Professor
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Degree

  • 博士(理学) ( 2004.3   大阪大学 )

Research Interests

  • 銅酸化物高温超伝導体

  • heavy fermion

  • 超伝導

  • superconductivity

  • Nuclear Magnetic Resonance/Nuclear Quadrupole Resonance

  • 強磁場

  • トポロジカル超伝導体

  • strain

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

Education

  • 大阪大学大学院   基礎工学研究科博士後期課程物理系専攻  

    2001.4 - 2004.3

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  • Osaka University    

    - 2004

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  • 大阪大学大学院   基礎工学研究科博士前期課程物理系専攻  

    1999.4 - 2001.3

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    Country: Japan

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  • Osaka University   基礎工学部   物性物理工学科

    1995.4 - 1999.3

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    Country: Japan

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  • Osaka University    

    - 1999

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Research History

  • Okayama University   The Graduate School of Natural Science and Technology

    2013.1

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  • - Associate Professor,Graduate School of Natural Science and Technology,Okayama University

    2013

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  • Okayama University   The Graduate School of Natural Science and Technology

    2006.4 - 2012.12

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  • Senior Assistant Professor,Graduate School of Natural Science and Technology,Okayama University

    2006 - 2012

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  • Osaka University   Graduate School of Engineering Science

    2005.4 - 2006.3

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  • Osaka University   Graduate School of Engineering Science

    2004.4 - 2005.3

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  • Postdoctoral Fellowships of Japan Society for the Promotion of Science

    2004 - 2005

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  • Osaka University   Graduate School of Engineering Science

    2003.4 - 2004.3

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Professional Memberships

Committee Memberships

  • 日本物理学会   第71-72期代議員  

    2015.3 - 2017.3   

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    Committee type:Academic society

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  • 日本物理学会   領域8運営委員  

    2014.10 - 2015.9   

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Papers

  • Antiferromagnetic spin fluctuations and superconductivity in NbRh2B2 and TaRh2B2 with a chiral crystal structure Reviewed

    Kazuaki Matano, Ryo Ogura, Mateo Fountaine, Harald O. Jeschke, Shinji Kawasaki, Guo-qing Zheng

    Physical Review B   104 ( 22 )   2021.12

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physrevb.104.224508

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.104.224508/fulltext

  • Charge Order and Fluctuations in Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ Revealed by $^{63,65}$Cu-Nuclear Magnetic Resonance Invited Reviewed

    Shinji Kawasaki, Madoka Ito, Dai Kamijima, Chengtian Lin, Guo-qing Zheng

    Journal of the Physical Society of Japan   90   111008   2021.8

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  • Transport signatures of the pseudogap critical point in the cuprate superconductor Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ Reviewed

    M. Lizaire, A. Legros, A. Gourgout, S. Benhabib, S. Badoux, F. Laliberté, M.-E. Boulanger, A. Ataei, G. Grissonnanche, D. LeBoeuf, S. Licciardello, S. Wiedmann, S. Ono, H. Raffy, S. Kawasaki, G.-Q. Zheng, N. Doiron-Leyraud, C. Proust, L. Taillefer

    Physical Review B   104   014515   2021.7

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  • Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh$_{0.5}$Ir$_{0.5}$In$_5$ Reviewed

    Shinji Kawasaki, Toshihide Oka, Akira Sorime, Yuji Kogame, Kazuhiro Uemoto, Kazuaki Matano, Jing Guo, Shu Cai, Liling Sun, John L. Sarrao, Joe D. Thompson, Guo-qing Zheng

    Communications Physics   3 ( 1 )   148   2020.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATURE PUBLISHING GROUP  

    A fundamental problem posed from the study of correlated electron compounds, of which heavy-fermion systems are prototypes, is the need to understand the physics of states near a quantum critical point (QCP). At a QCP, magnetic order is suppressed continuously to zero temperature and unconventional superconductivity often appears. Here, we report pressure T-c. (P)-dependent In-115 nuclear quadrupole resonance (NQR) measurements on heavy-fermion antiferromagnet CeRh0.5Ir0.5In5. These experiments reveal an antiferromagnetic (AF) QCP at P-c(AF) = 1.2 GPa where a dome of superconductivity reaches a maximum transition temperature Tc. Preceding P-c(AF), however, the NQR frequency nu(Q) undergoes an abrupt increase at P-c* = 0.8 GPa in the zero-temperature limit, indicating a change from localized to itinerant character of cerium's f-electron and associated small-to-large change in the Fermi surface. At P-c(AF) where T-c is optimized, there is an unusually large fraction of gapless excitations well below T-c that implicates spin-singlet, odd-frequency pairing symmetry.

    DOI: 10.1038/s42005-020-00418-x

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  • Charge-density-wave order takes over antiferromagnetism in Bi$_2$Sr$_{2-x}$La$_x$CuO$_6$ superconductors Reviewed

    S. Kawasaki, Z. Li, M. Kitahashi, C. T. Lin, P. L. Kuhns, A. P. Reyes, Guo-qing Zheng

    NATURE COMMUNICATIONS   8   1267   2017.11

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    Superconductivity appears in the cuprates when a spin order is destroyed, while the role of charge is less known. Recently, charge density wave (CDW) was found below the superconducting dome in YBa(2)Cu(3)Oy when a high magnetic field is applied perpendicular to the CuO2 plane, which was suggested to arise from incipient CDW in the vortex cores that becomes overlapped. Here by Cu-63-nuclear magnetic resonance, we report the discovery of CDW induced by an in-plane field, setting in above the dome in single-layered Bi2Sr2-xLaxCuO6. The onset temperature T-CDW takes over the antiferromagnetic order temperature T-N beyond a critical doping level at which superconductivity starts to emerge, and scales with the pseudogap temperature T*. These results provide important insights into the relationship between spin order, CDW and the pseudogap, and their connections to high-temperature superconductivity.

    DOI: 10.1038/s41467-017-01465-9

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  • 20pBM-2 Magnetic field induced CDW in the pseudogap state of Bi2201 superconductor revealed by Cu-NMR

    Kitahashi M., Kawasaki S., Lin Chengtian T., Zheng Guo-qing

    Meeting Abstracts of the Physical Society of Japan   71   2071 - 2071   2016

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

    DOI: 10.11316/jpsgaiyo.71.1.0_2071

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  • Doping-enhanced antiferromagnetism in Ca$_{1-x}$La$_x$FeAs$_2$ Reviewed

    Shinji Kawasaki, Tomosuke Mabuchi, Satoki Maeda, Tomoki Adachi, Tasuku Mizukami, Kazutaka Kudo, Minoru Nohara, Guo-Qing Zheng

    Physical Review B - Condensed Matter and Materials Physics   92 ( 18 )   2015.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society  

    In iron pnictides, high temperature superconductivity emerges after suppressing antiferromagnetism by doping. Here, we show that antiferromagnetism in Ca1-xLaxFeAs2 is robust against and even enhanced by doping. Using As75-nuclear magnetic resonance and nuclear quadrupole resonance techniques, we find that an antiferromagnetic order occurs below the Néel temperature TN=62 K at a high doping concentration (x=0.15) where superconductivity sets in at the transition temperature Tc=35 K. In the superconducting state coexisting with antiferromagnetism, the nuclear-spin-lattice relaxation rate 1/T1 becomes proportional to T, indicating gapless excitations. Unexpectedly, TN is enhanced with increasing doping, rising up to TN=70 K at x=0.24. The obtained phase diagram of this system enriches the physics of iron-based high-Tc superconductors.

    DOI: 10.1103/PhysRevB.92.180508

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  • Coexistence of multiple charge-density waves and superconductivity in SrPt2As2 revealed by As-75-NMR/NQR and Pt-195-NMR Reviewed

    Shinji Kawasaki, Yoshihiko Tani, Tomosuke Mabuchi, Kazutaka Kudo, Yoshihiro Nishikubo, Daisuke Mitsuoka, Minoru Nohara, Guo-Qing Zheng

    PHYSICAL REVIEW B   91 ( 6 )   060510(R)   2015.2

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    The relationship between charge-density wave (CDW) orders and superconductivity in arsenide superconductor SrPt2As2 with T-c = 5.2K which crystallizes in the CaBe2Ge2-type structure was studied by As-75 nuclear magnetic resonance (NMR) measurements up to 520 K, and As-75 nuclear quadrupole resonance (NQR) and Pt-195-NMR measurements down to 1.5 K. At high temperature, As-75-NMR spectrum and nuclear-spin-relaxation rate (1/T-1) have revealed two distinct CDW orders, one realized in the As-Pt-As layer below T-CDW(As(1)) = 410 K and the other in the Pt-As-Pt layer below T-CDW(As(2)) = 255 K. The 1/T-1 measured by As-75-NQR shows a clear Hebel-Slichter peak just below Tc and decreases exponentially well below T-c. Concomitantly, Pt-195 Knight shift decreases below T-c. Our results indicate that superconductivity in SrPt2As2 is in the spin-singlet state with an s-wave gap and is robust under the two distinct CDW orders in different layers.

    DOI: 10.1103/PhysRevB.91.060510

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  • 16pCD-3 Coexistence of multiple charge-density waves and superconductivity in SrPt_2As_2 revealed by ^<75>As-NMR/NQR and ^<195>Pt-NMR

    Kawasaki S., Tani Y., Mabuchi T., Kudo K., Nishikubo Y., Mitsuoka D., Nohara M., Zheng Guo-qing

    Meeting Abstracts of the Physical Society of Japan   70   1704 - 1704   2015

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

    DOI: 10.11316/jpsgaiyo.70.2.0_1704

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  • 24pDC-5 Cu-NMR study of pseudogap state of copper oxide superconductors Bi_2Sr_<2-x>La_xCuO_<6+δ>

    Kitahashi M., Kawasaki S., Lin C.T., Zheng Guo-qing

    Meeting Abstracts of the Physical Society of Japan   70   2485 - 2485   2015

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

    DOI: 10.11316/jpsgaiyo.70.1.0_2485

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  • 22aBA-5 NMR/NQR study of Ca_<1-x>La_xFeAs_2

    Mabuchi T., Kawasaki S., Mizukami T., Kudo K., Nohara M., Zheng G. -q.

    Meeting Abstracts of the Physical Society of Japan   70   2059 - 2059   2015

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

    DOI: 10.11316/jpsgaiyo.70.1.0_2059

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  • 21pBA-3 NMR study of Sr_2VFeAsO_3

    Ueshima K., Han F., Zhu X., Wen Hai-Hu, Kawasaki S., Zheng Guo-qing

    Meeting Abstracts of the Physical Society of Japan   70   1989 - 1989   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_1989

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  • Magnetism and superconductivity in Sr2VFeAsO3 revealed by As-75- and V-51-NMR under elevated pressures Reviewed

    Keiji Ueshima, Fei Han, Xiyu Zhu, Hai-Hu Wen, Shinji Kawasaki, Guo-qing Zheng

    PHYSICAL REVIEW B   89 ( 18 )   184506   2014.5

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    We report As-75 and V-51 nuclear magnetic resonance (NMR) measurements on the iron-based superconductor Sr2VFeAsO3 with alternating stacks structure. We find that the As-75 nuclear spin-spin relaxation rate (1/T-2) shows a pronounced peak at T-N = 165 K, below which the resonance peak shifts to a higher frequency due to the onset of an internal magnetic field. The V-51 spectrum does not shift, but is broadened below T-N. We conclude that the Fe electrons order antiferromagnetically below T-N with a magnetic moment m(Fe) similar to 0.4 mu B. Application of external pressure up to 2.4 GPa reduces T-N at a rate of -40 K/GPa, and enhances the superconducting transition temperature T-c at a rate of 2 K/GPa. The pressure-temperature phase diagram for Sr2VFeAsO3 shows that superconductivity coexists with antiferromagnetism over a wide pressure range with an unprecedented high T-c up to 36.5 K.

    DOI: 10.1103/PhysRevB.89.184506

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  • The Mott State and Superconductivity in Face-Centred Cubic Structured Cs3C60: A Cs-133-Nuclear Magnetic Resonance Study under Pressure Reviewed

    Shinji Kawasaki, Junji Fukui, Takeshi Motoyama, Yuta Suzuki, Seiji Shibasaki, Guo-qing Zheng

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82 ( 1 )   014709   2013.1

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    Over the past 20 years, fullerides have been studied as the source of high-transition-temperature (T-c) superconductivity except for copper oxides. The recent finding of the Mott insulating state right beside superconductivity in Cs3C60 has suggested that magnetism helps raise T-c even in fullerides as in heavy-fermion compounds, high-T-c copper oxides, two-dimensional organic conductors, and iron pnictides. Namely, one tends to think that the link between Mott insulator and superconductivity takes place in fullerides, which can give rise to the mechanism beyond the Bardeen-Cooper-Schrieffer framework. However, the relationship between the Mott state and the superconductivity in Cs3C60 is still under debate. By nuclear magnetic resonance measurements under pressure, we find that the magnetism and superconductivity in Cs3C60 are competing orders. Different from previous reports, the phase separation of Cs3C60 crystals into the Mott and metallic states allows us to systematically study the evolution of the ground state under pressure. Our careful experiments have found that the prevention of a magnetic order is rather essential for the superconductivity in face-centred cubic Cs3C60, which presents a basic strategy for finding still higher T-c in this system.

    DOI: 10.7566/JPSJ.82.014709

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  • Pseudogap Ground State and Its Doping Evolution in Bi2Sr2-xLaxCuO6+delta: Removing the Superconducting State by the Application of Very High Magnetic Fields Reviewed

    Guo-qing Zheng, S. Kawasaki, C. T. Lin, P. L. Kuhns, A. P. Reyes

    JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM   25 ( 5 )   1249 - 1253   2012.7

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    We present results for the pseudogap ground state and its doping evolution in single-layered copper-oxide Bi2Sr2-x La (x) CuO6+delta . We apply very high magnetic fields up to 44 T to remove the superconducting state and reveal the hidden low temperature (T) normal state. Through Cu-63-NMR Knight shift and spin-lattice relaxation rate measurements, we find that there remains a finite density of states (DOS) at the Fermi level in the zero-T limit when the superconductivity is removed, which indicates that the pseudogap ground state is a metallic state with a finite volume of Fermi surface. The residual DOS in the pseudogap ground state decreases with decreasing doping (increasing x), but remains quite large even at the vicinity of the magnetically ordered phase of xa parts per thousand yen 0.8. The result indicates that the superconductivity emerges from the remaining Fermi surface and coexists with the pseudogap.

    DOI: 10.1007/s10948-012-1575-4

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  • Luttinger-volume violating Fermi liquid in the pseudogap phase of the cuprate superconductors Reviewed

    Jia-Wei Mei, Shinji Kawasaki, Guo-Qing Zheng, Zheng-Yu Weng, Xiao-Gang Wen

    PHYSICAL REVIEW B   85 ( 13 )   134519   2012.4

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    Based on the NMR measurements on Bi2Sr2-xLaxCuO6+delta (La-Bi2201) in strong magnetic fields, we identify the nonsuperconducting pseudogap phase in the cuprates as a Luttinger-volume violating Fermi liquid (LvvFL). This state is a zero-temperature quantum liquid that does not break translational symmetry, and yet, the Fermi surface encloses a volume smaller than the large one given by the Luttinger theorem. The particle number enclosed by the small Fermi surface in the LvvFL equals the doping level p, not the total electron number n(e) = 1 - p. Both the phase string theory and the dopon theory are introduced to describe the LvvFL. For the dopon theory, we can obtain a semiquantitative agreement with the NMR experiments.

    DOI: 10.1103/PhysRevB.85.134519

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  • Antiferromagnetic Spin Fluctuations above the Dome-Shaped and Full-Gap Superconducting States of LaFeAsO1-xFx Revealed by As-75-Nuclear Quadrupole Resonance Reviewed

    T. Oka, Z. Li, S. Kawasaki, G. F. Chen, N. L. Wang, Guo-qing Zheng

    PHYSICAL REVIEW LETTERS   108 ( 4 )   047001-1-047001-5   2012.1

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    We report a systematic study by As-75 nuclear-quadrupole resonance in LaFeAsO1-xFx. The antiferro-magnetic spin fluctuation found above the magnetic ordering temperature T-N = 58 K for x = 0.03 persists in the regime 0.04 &lt;= x &lt;= 0.08, where superconductivity sets in. A dome-shaped x dependence of the superconducting transition temperature T-c is found, with the highest T-c = 27 K at x = 0.06, which is realized under significant antiferromagnetic spin fluctuation. With increasing x further, the antiferromagnetic spin fluctuation decreases, and so does T-c. These features resemble closely the cuprates La2-xSrxCuO4. In x = 0.06, the spin-lattice relaxation rate (1/T-1) below T-c decreases exponentially down to 0.13T(c), which unambiguously indicates that the energy gaps are fully opened. The temperature variation of 1/T1 below T-c is rendered nonexponential for other x by impurity scattering.

    DOI: 10.1103/PhysRevLett.108.047001

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  • Cu-NMR Study of Bi2Sr1.6La0.4CuO6+delta Superconductor in Very High Magnetic Fields Reviewed

    S. Kawasaki, C. T. Lin, P. L. Kuhns, A. P. Reyes, Guo-qing Zheng

    26TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT26), PTS 1-5   400   2012

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

    We report the results of (63,65) Cu-NMR measurements on single-layered copper-oxide Bi2Sr1.6La0.4CuO6+delta (T-c = 32 K) conducted under very high magnetic fields up to 45 T. The high magnetic field suppresses superconductivity completely, and the pseudogap ground state is revealed. The Cu-63-NMR Knight shift shows that there remains a finite density of states at the Fermi level in the zero-temperature limit, which indicates that the pseudogap ground state is a metallic state with a fi nite volume of Fermi surface.

    DOI: 10.1088/1742-6596/400/2/022052

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  • As-NMR/NQR study of CaFe2As2 under pressure Reviewed

    Shinji Kawasaki, Toshihide Oka, Takahisa Tabuchi, X. F. Wang, X. H. Chen, Guo-qing Zheng

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80   2011.7

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    As-75-zero-field nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements are performed on CaFe2As2 under pressure. At P = 4.7 and 10.8 kbar, the temperature dependence of nuclear-spin-lattice relaxation rate (1/T-1) measured at tetragonal phase show no coherence peak just below T-c and decrease with decreasing temperature. The superconductivity is of gapless at P = 4.7 kbar but evolves to multiple gaps at P = 10.8 kbar. We find that the superconductivity appears near a quantum critical point. Both electron correlation and superconductivity disappear in the collapsed tetragonal phase. A systematic study under pressure indicates that electron correlations play a vital role in forming Cooper pairs in this compound.

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  • As-NQR study of superconductivity in LaRAsO1-xFx (R=Fe and Ni)

    T. Oka, T. Tabuchi, Z. Li, S. Kawasaki, G. F. Chen, J. L. Luo, N. L. Wang, Guo-qing Zheng

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   72 ( 5 )   497 - 500   2011.5

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    We report As-75 nuclear quadrupole resonance (NQR) studies on oxypnictide superconductors LaFeAsO1-xFx (x=0.08, 0.15) and LaNiAsO1-xFx (x=0, 0.06, 0.10, 0.12). In LaFeAsO0.92F0.08 (T-c=23 K), nuclear spin-lattice relaxation rate 1/T-1 shows no coherence peak just below T-c and decreases with decreasing temperature accompanied by a hump structure at T similar to 0.4T(c), which is a characteristic of the multigap superconductivity. In the normal state, the quantity 1/T1T increases with decreasing temperature to T-c, indicating that the existence of antiferromagnetic correlation originating from its multiple electronic band structure. On the other hand, LaNiAsO1-xFx shows a clear Hebel-Slichter (coherence) peak just below T-c, evidencing that the LaNiAsO1-xFx is a BCS superconductor. In the normal state, 1/T-1 T is constant in the temperature range 4 &lt;= T &lt;= 10 K for all LaNiAsO1-xFx, which indicates electron correlations are weak. We suggest that the contrasting behavior of both superconductivity and electron correlations in LaFeAsO0.92F0.08 and LaNiAsO1-xFx between them relate to the difference of electronic band structure configuration. We also provide a possible interpretation for the pseudogap-like behavior in the normal state observed in both compounds. (C) 2010 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jpcs.2010.10.022

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  • As-NMR/NQR study of pressure-induced superconductivity in CaFe2As2

    S. Kawasaki, T. Oka, T. Tabuchi, X. F. Wang, X. H. Chen, Guo-qing Zheng

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   72 ( 5 )   501 - 504   2011.5

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    As-75-zero-field nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements are performed on CaFe2As2 under pressure. At P=4.7 and 10.8 kbar, the temperature dependence of nuclear-spin-lattice relaxation rate (1/T-1) measured at tetragonal phase show no coherence peak just below T-c and decrease with decreasing temperature. The superconductivity is of gapless at P=4.7 kbar but evolves to multiple gaps at P=10.8 kbar. We find that the superconductivity appears near a quantum critical point. Both electron correlation and superconductivity disappear in the collapsed tetragonal phase. A systematic study under pressure indicates that electron correlations play a vital role in forming Cooper pairs in this compound. (C) 2010 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jpcs.2010.10.010

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  • Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides: Comparison with nickel analog

    Z. Li, S. Kawasaki, T. Oka, T. Tabuchi, Y. Ooe, M. Ichioka, Z. A. Ren, Z. X. Zhao, J. L. Luo, N. L. Wang, X. C. Wang, Q. Q. Liu, C. Q. Jin, C. T. Lin, Guo-qing Zheng

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   72 ( 5 )   492 - 496   2011.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    We present extensive (75)As NMR and NQR data on the superconducting arsenides PrFeAs(0.89)F(0.11) (T(c) = 45 K), LaFeAsO(0.92)F(0.08) (T(c) = 27 K), LiFeAs (T(c) = 17 K) and Ba(0.72)K(0.28)Fe(2)As(2) (T(c) = 31.5 K) single crystal, and compare with the nickel analog LaNiAsO(0.9)F(0.1) (T(c) = 4.0 K). In contrast to LaNiAsO(0.9)F(0.1) where the superconducting gap is shown to be isotropic, the spin lattice relaxation rate 1/T(1) in the Fe-arsenides decreases below T(c) with no coherence peak and shows a step-wise variation at low temperatures. The Knight shift decreases below T(c) and shows a step-wise T variation as well. These results indicate spin-singlet superconductivity with multiple gaps in the Fe-arsenides. The Fe antiferromagnetic spin fluctuations are anisotropic and weaker compared to underdoped copper-oxides or cobalt-oxide superconductors, while there is no significant electron correlations in LaNiAsO(0.9)F(0.1). We will discuss the implications of these results and highlight the importance of the Fermi surface topology. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jpcs.2010.10.038

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  • Carrier-Concentration Dependence of the Pseudogap Ground State of Superconducting Bi(2)Sr2-xLaxCuO6+delta Revealed by Cu-63,Cu-65-Nuclear Magnetic Resonance in Very High Magnetic Fields Reviewed

    Shinji Kawasaki, Chengtian Lin, Philip L. Kuhns, Arneil P. Reyes, Guo-qing Zheng

    PHYSICAL REVIEW LETTERS   105 ( 13 )   137002   2010.9

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

    We report the results of the Knight shift by Cu-63,Cu-65-NMR measurements on single-layered copper-oxide Bi2Sr2-xLaxCuO6+delta conducted under very high magnetic fields up to 44 T. The magnetic field suppresses superconductivity completely, and the pseudogap ground state is revealed. The Cu-63-NMR Knight shift shows that there remains a finite density of states at the Fermi level in the zero-temperature limit, which indicates that the pseudogap ground state is a metallic state with a finite volume of Fermi surface. The residual density of states in the pseudogap ground state decreases with decreasing doping (increasing x) but remains quite large even at the vicinity of the magnetically ordered phase of x &gt;= 0.8, which suggests that the density of states plunges to zero upon approaching the Mott insulating phase.

    DOI: 10.1103/PhysRevLett.105.137002

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  • Multiple Superconducting Gaps and Anisotropic Spin Fluctuations in Hole-Doped and Electron-Doped Iron-Pnictides: NMR Studies

    Guo-qing Zheng, K. Matano, S. Kawasaki, Z. Li, G. L. Sun, D. L. Sun, C. T. Lin, G. F. Chen, J. L. Luo, N. L. Wang, Z. A. Ren, Z. X. Zhao

    JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM   23 ( 5 )   609 - 612   2010.7

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    We present extensive As-75-NMR data on the electron-doped pnictides PrFeAsO0.89F0.11 (T-c = 45 K), LaFeAsO0.92F0.08 (T-c = 23 K), and the hole-doped Ba0.72K0.28Fe2As2 (T-c = 31.5 K) single crystal. We find that the Fe antiferromagnetic spin fluctuations are anisotropic and are weaker compared to underdoped copper-oxides or cobalt-oxide superconductors. The spin lattice relaxation rate 1 / T-1 decreases below T-c with no coherence peak and shows a step-wise variation at low temperatures. The Knight shift decreases below T-c and shows a step-wise T variation as well. These results indicate spin-singlet superconductivity with multiple gaps.

    DOI: 10.1007/s10948-010-0749-1

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  • Pressure-induced unconventional superconductivity near a quantum critical point in CaFe2As2 Invited Reviewed

    S. Kawasaki, T. Tabuchi, X. F. Wang, X. H. Chen, Guo-qing Zheng

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   23 ( 5 )   054004   2010.5

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    As-75-zero-field nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements are performed on CaFe2As2 under pressure. At P = 4.7 and 10.8 kbar, the temperature dependencies of nuclear-spin-lattice relaxation rate (1/T-1) measured in the tetragonal phase show no coherence peak just below T-c(P) and decrease with decreasing temperature. The superconductivity is gapless at P = 4.7 kbar but evolves to that with multiple gaps at P = 10.8 kbar. We find that the superconductivity appears near a quantum critical point under pressures in the range 4.7 kbar &lt;= P &lt;= 10.8 kbar. Both electron correlation and superconductivity disappear in the collapsed tetragonal phase. A systematic study under pressure indicates that electron correlations play a vital role in forming Cooper pairs in this compound.

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  • Evidence for a full energy gap in the nickel pnictide superconductor LaNiAsO1-xFx from As-75 nuclear quadrupole resonance Reviewed

    T. Tabuchi, Z. Li, T. Oka, G. F. Chen, S. Kawasaki, J. L. Luo, N. L. Wang, Guo-qing Zheng

    PHYSICAL REVIEW B   81 ( 14 )   140509(R)   2010.4

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    We report systematic As-75-NQR and La-139-NMR studies on nickel pnictide superconductors LaNiAsO1-xFx (x=0, 0.06, 0.10, and 0.12). The spin-lattice relaxation rate 1/T-1 decreases below T-c with a well-defined coherence peak and follows an exponential decay at low temperatures. This result indicates that the superconducting gap is fully opened and is strikingly different from that observed in iron-pnictide analogs. In the normal state, 1/T1T is constant in the temperature range T-c similar to 4 K &lt; T &lt; 10 K for all compounds and up to T=250 K for x=0 and 0.06, which indicates weak electron correlations and is also different from the iron analog. We argue that the differences between the iron and nickel pnictides arise from the different electronic band structure. Our results highlight the importance of the peculiar Fermi-surface topology in iron pnictides. We also provide a possible interpretation for the "pseudogap-like" behavior in the normal state which is also seen in iron pnictides.

    DOI: 10.1103/PhysRevB.81.140509

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  • Spin-Echo NMR in Pulsed High Magnetic Fields up to 48 T Reviewed

    Guo-qing Zheng, Kouta Katayama, Masahide Nishiyama, Shinji Kawasaki, Naoki Nishihagi, Shojiro Kimura, Masayuki Hagiwara, Koichi Kindo

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   78 ( 9 )   095001   2009.9

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    DOI: 10.1143/JPSJ.78.095001

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  • Superconducting state in the noncentrosymmetric Mg9.3Ir19B16.7 and Mg10.5Ir19B17.1 revealed by NMR Reviewed

    K. Tahara, Z. Li, H. X. Yang, J. L. Luo, S. Kawasaki, Guo-qing Zheng

    PHYSICAL REVIEW B   80 ( 6 )   060503(R)   2009.8

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    We report B-11 NMR measurements in noncentrosymmetric superconductors Mg9.3Ir19B16.7 (T-c=5.8 K) and Mg10.5Ir19B17.1 (T-c=4.8 K). The spin-lattice relaxation rate and the Knight shift indicate that the Cooper pairs are predominantly in the spin-singlet state with an isotropic gap. However, Mg10.5Ir19B17.1 is found to have more defects and the spin susceptibility remains finite even in the zero-temperature limit. We interpret this result as that the defects enhance the spin-orbit coupling and bring about more spin-triplet component.

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  • Measurement of electron correlations in LixCoO2 (x=0.0-0.35) using Co-59 nuclear magnetic resonance and nuclear quadrupole resonance techniques Reviewed

    S. Kawasaki, T. Motohashi, K. Shimada, T. Ono, R. Kanno, M. Karppinen, H. Yamauchi, Guo-qing Zheng

    PHYSICAL REVIEW B   79 ( 22 )   220514(R)   2009.6

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    CoO2 is the parent compound for the superconductor NaxCoO2 center dot 1.3H(2)O and was widely believed to be a Mott insulator. We performed Co-59 nuclear magnetic resonance and nuclear quadrupole resonance studies on LixCoO2 (x=0.35, 0.25, 0.12, and 0.0) to uncover the electronic state and spin correlations in this series of compounds which was recently obtained through electrochemical deintercalation of Li from pristine LiCoO2. We find that although the antiferromagnetic spin correlations systematically increase with decreasing Li content (x), the end member, CoO2, is a noncorrelated metal that well satisfies the Korringa relation for a Fermi liquid. Thus, CoO2 is not simply located at the limit of x -&gt; 0 for A(x)CoO(2) (A=Li,Na) compounds. The disappearance of the electron correlations in CoO2 is due to the three dimensionality of the compound which is in contrast to the highly two-dimensional structure of A(x)CoO(2).

    DOI: 10.1103/PhysRevB.79.220514

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  • Two superconducting gaps in LaFeAsO0.92F0.08 revealed by As-75 nuclear quadrupole resonance Reviewed

    S. Kawasaki, K. Shimada, G. F. Chen, J. L. Luo, N. L. Wang, Guo-qing Zheng

    PHYSICAL REVIEW B   78 ( 22 )   220506(R)   2008.12

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    We report As-75 nuclear quadrupole resonance studies on superconducting oxypnictide LaFeAsO0.92F0.08 (T-c=23 K). The temperature dependence of the spin-lattice relaxation rate (1/T-1) decreases below T-c without a coherence (Hebel-Slichter) peak and shows a temperature dependence that is not simple power law nor exponential. We show that the result can be understood in terms of two superconducting gaps of either d- or +/- s-wave symmetry, with the larger gap Delta(1)similar to 4k(B)T(c) and the smaller one Delta(2)similar to 1.5k(B)T(c). Our result suggests that the multiple-gap feature is universal in the oxypnictide superconductors, which is probably associated with the multiple electronic band structures in this class of materials. We also find that 1/T1T above T-c increases with decreasing temperature, which suggests weak magnetic fluctuations in the normal state.

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  • (123)Sb-NQR study of unconventional superconductivity in the filled skutterudite heavy-fermion compound PrOs(4)Sb(12) under high pressure up to 3.82 GPa Reviewed

    S. Kawasaki, K. Katayama, H. Sugawara, D. Kikuch, H. Sato, Guo-qing Zheng

    PHYSICAL REVIEW B   78 ( 6 )   064510-1-064510-7   2008.8

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    We report (123)Sb nuclear-quadrupole-resonance (NQR) measurements of the filled skutterudite heavy-fermion superconductor PrOs(4)Sb(12) under high pressure. The temperature dependence of NQR frequency and the spin-lattice relaxation rate 1/T(1) indicate that the crystal-electric-field splitting Delta(CEF) between the ground-state Gamma(1) singlet and the first-excited-state Gamma((2))(4) triplet decreases with increasing pressure. ac-susceptibility measurements indicate that the superconducting transition temperature (T(c)) also decreases with increasing pressure. However, above P similar to 2 GPa, both Delta(CEF) and T(c) do not depend on external pressure up to P =3.82 GPa. These pressure dependences of Delta(CEF) and T(c) suggest an intimate relationship between quadrupole excitations associated with the Gamma((2))(4) level and unconventional superconductivity in PrOs(4)Sb(12). In the superconducting state, 1/T(1) below T(c)= 1.55 and 1.57 K at P= 1.91 and 2.63 GPa shows a power-law temperature variations and is proportional to T(5) at temperatures considerably below T(c). These data can be well fitted by the gap model Delta(theta) = Delta(0) sin theta, with Delta(0)= 3.08k(B)T(c) and 3.04k(B)T(c) for P= 1.91 and 2.63 GPa, respectively. The results indicate that there exist point nodes in the gap function.

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  • Unconventional superconductivity and antiferromagnetic quantum phase transition in CeRhIn5 : In-115-NQR study under pressure Reviewed

    M. Yashima, S. Kawasaki, H. Mukuda, Y. Kitaoka, H. Shishido, R. Settai, Y. Onuki

    PHYSICA B-CONDENSED MATTER   403 ( 5-9 )   914 - 916   2008.4

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    We report on the pressure (P)-induced phase diagram of antiferromagnetism (AFM) and superconductivity (SC) which emerges at their border at zero magnetic field. The nuclear-quadrupole-resonance (NQR) measurements have revealed that AFM can take place in the superconducting state with T-c similar to 2.1 K at P = 2.05 GPa and the AFM quantum phase transition (QPT) occurs near P = 2.1 GPa. These results reveal the existence of the tetracritical point in the P-T phase diagram of AFM and SC in CeRnIn5. We also found the gapless nature in the uniformly coexisting phase of AFM and SC, indicating an intimate relationship between AFM and SC. (c) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2007.10.062

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  • Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn3: An In115 -NQR study under pressure Reviewed

    S. Kawasaki, M. Yashima, Y. Kitaoka, K. Takeda, K. Shimizu, Y. Oishi, M. Takata, T. C. Kobayashi, H. Harima, S. Araki, H. Shishido, R. Settai, Y. Onuki

    Physical Review B - Condensed Matter and Materials Physics   77 ( 6 )   2008.2

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    We report on pressure-induced unconventional superconductivity (SC) in the heavy-fermion (HF) antiferromagnet CeIn3 by means of nuclear-quadrupole- resonance (NQR) studies conducted under a high pressure. The temperature (T) and pressure (P) dependences of the In-NQR spectra have revealed a first-order quantum-phase transition (QPT) from antiferromagnetism (AFM) to paramagnetism (PM) at a critical pressure Pc =2.46 GPa at which AFM disappears with a minimum value of TN (Pc) =1.2 K. High-energy x-ray scattering measurements under P show a progressive decrease in the lattice density without any change in the crystal structure, whereas an increase in the NQR frequency (νQ) indicates an increase in the hybridization between 4f electrons and conduction electrons, which stabilizes the HF-PM state. This competition between the AFM phase where TN is reduced and the formation of the HF-PM phase triggers the first-order QPT at Pc =2.46 GPa. Despite the lack of an AFM quantum critical point in the P-T phase diagram, we highlight the fact that unconventional SC occurs in both phases of AFM and PM. The measurements of the nuclear spin-lattice relaxation rate 1/T1 in the AFM phase have provided evidence for the uniformly coexisting AFM+SC phase. Remarkably, the significant increase in 1/T1 upon cooling in the AFM phase has revealed the development of low-lying magnetic excitations down to Tc in the AFM phase
    it is indeed relevant to the onset of the uniformly coexisting AFM+SC phase. In the HF-PM phase where AFM fluctuations are not developed, 1/T1 decreases without the coherence peak just below Tc, followed by a power-law-like T dependence that indicates an unconventional SC with a line-node gap. Remarkably, Tc has a peak around Pc in the HF-PM phase as well as in the AFM phase. In other words, an SC dome exists with a maximum value of Tc =230 mK around Pc, indicating that the origin of the pressure-induced HF SC in CeIn3 is not relevant to AFM spin fluctuations but to the emergence of the first-order QPT in CeIn3. These phenomena observed in CeIn3 should be understood in terms of the first-order QPT because these new phases of matter are induced by applying P. When the AFM critical temperature is suppressed at the termination point of the first-order QPT, Pc =2.46 GPa, the diverging AFM spin-density fluctuations emerge at the critical point from AFM to PM. The results with CeIn3 leading to a new type of quantum criticality deserve further theoretical investigations. © 2008 The American Physical Society.

    DOI: 10.1103/PhysRevB.77.064508

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  • Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn3: An In-115-NQR study under pressure Reviewed

    S. Kawasaki, M. Yashima, Y. Kitaoka, K. Takeda, K. Shimizu, Y. Oishi, M. Takata, T. C. Kobayashi, H. Harima, S. Araki, H. Shishido, R. Settai, Y. Onuki

    PHYSICAL REVIEW B   77 ( 6 )   064508-1-064508-12   2008.2

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    We report on pressure-induced unconventional superconductivity (SC) in the heavy-fermion (HF) antiferromagnet CeIn3 by means of nuclear-quadrupole-resonance (NQR) studies conducted under a high pressure. The temperature (T) and pressure (P) dependences of the In-NQR spectra have revealed a first-order quantum-phase transition (QPT) from antiferromagnetism (AFM) to paramagnetism (PM) at a critical pressure P-c=2.46 GPa at which AFM disappears with a minimum value of T-N(P-c)=1.2 K. High-energy x-ray scattering measurements under P show a progressive decrease in the lattice density without any change in the crystal structure, whereas an increase in the NQR frequency (nu(Q)) indicates an increase in the hybridization between 4f electrons and conduction electrons, which stabilizes the HF-PM state. This competition between the AFM phase where T-N is reduced and the formation of the HF-PM phase triggers the first-order QPT at P-c=2.46 GPa. Despite the lack of an AFM quantum critical point in the P-T phase diagram, we highlight the fact that unconventional SC occurs in both phases of AFM and PM. The measurements of the nuclear spin-lattice relaxation rate 1/T-1 in the AFM phase have provided evidence for the uniformly coexisting AFM+SC phase. Remarkably, the significant increase in 1/T-1 upon cooling in the AFM phase has revealed the development of low-lying magnetic excitations down to T-c in the AFM phase; it is indeed relevant to the onset of the uniformly coexisting AFM+SC phase. In the HF-PM phase where AFM fluctuations are not developed, 1/T-1 decreases without the coherence peak just below T-c, followed by a power-law-like T dependence that indicates an unconventional SC with a line-node gap. Remarkably, T-c has a peak around P-c in the HF-PM phase as well as in the AFM phase. In other words, an SC dome exists with a maximum value of T-c=230 mK around P-c, indicating that the origin of the pressure-induced HF SC in CeIn3 is not relevant to AFM spin fluctuations but to the emergence of the first-order QPT in CeIn3. These phenomena observed in CeIn3 should be understood in terms of the first-order QPT because these new phases of matter are induced by applying P. When the AFM critical temperature is suppressed at the termination point of the first-order QPT, P-c=2.46 GPa, the diverging AFM spin-density fluctuations emerge at the critical point from AFM to PM. The results with CeIn3 leading to a new type of quantum criticality deserve further theoretical investigations.

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  • Pressure dependence of the superconducting transition and electron correlations in NaxCoO2 center dot 1.3H(2)O

    E. Kusano, S. Kawasaki, K. Matano, Guo-Qing Zheng, R. L. Meng, J. Cmaidalka, C. W. Chu

    PHYSICAL REVIEW B   76 ( 10 )   100506-1-100506-4   2007.9

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    We report T-c and Co-59 nuclear quadrupole resonance measurements on the cobalt oxide superconductor NaxCoO2 center dot 1.3H(2)O (T-c=4.8 K) under hydrostatic pressure (P) up to 2.36 GPa. T-c decreases with increasing pressure at an average rate of -0.49 +/- 0.09 K/GPa. At low pressures P <= 0.49 GPa, the decrease of T-c is accompanied by a weakening of the spin correlations at a finite wave vector and a reduction of the density of states (DOS) at the Fermi level. At high pressures above 1.93 GPa, however, the decrease of T-c is mainly due to a reduction of the DOS. These results indicate that the electronic and magnetic state of Co is primarily responsible for the superconductivity. The spin-lattice relaxation rate 1/T-1 at P=0.49 GPa shows a T-3 variation below T-c down to T similar to 0.12T(c), which provides compelling evidence for the presence of line nodes in the superconducting gap function.

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  • Antiferromagnetic quantum phase transition in superconducting phase in CeRhIn5

    M. Yashima, S. Kawasaki, H. Mukuda, Y. Kitaoka, H. Shishido, R. Settai, Y. Onuki

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   460   670 - 671   2007.9

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    We report on the pressure (P)-induced phase diagram of antiferromagnetism (AFM) and superconductivity (SC) which emerges at their boarder at zero magnetic field. The nuclear quadrupole resonance (NQR) measurements have revealed that AFM can take place in the superconducting state with T-c similar to 2.1 K at P = 2.05 GPa and the AFM quantum phase transition (QPT) occurs near P = 2.1 GPa. These results suggest that AFM phase, AFM + SC uniformly coexisting phase, SC phase and paramagnetic phase all contact with each other at T-tetra similar to 2.1 K and P-tetra similar to 2 GPa which evidence the existence of the tetracritical point in the P-T phase diagram of AFM and SC in CeRnIn5 (C) 2007 Elsevier B.V. All rights reserved.

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  • Quantum phase diagram of antiferromagnetism and superconductivity with a tetracritical point in CeRhIn5 in zero magnetic field

    M. Yashima, S. Kawasaki, H. Mukuda, Y. Kitaoka, H. Shishido, R. Settai, Y. Onuki

    PHYSICAL REVIEW B   76 ( 2 )   020509-1-020509-4   2007.7

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    We report on a pressure-temperature phase diagram of antiferromagnetism (AFM) and superconductivity (SC) in CeRhIn5 studied by the nuclear-quadrupole-resonance measurements under pressure. It is demonstrated that an AFM phase transition takes place inside the superconducting state. This result reveals that a tetracritical point exists in the phase diagram of AFM and SC at zero magnetic field. The finding of unconventional SC characteristics in the uniformly coexisting phase of AFM and SC suggests that both phases may be mediated by the same magnetic interaction.

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  • Experimental evidence for ferromagnetic spin-pairing superconductivity emerging in UGe2: A Ge-73-nuclear-quadrupole-resonance study under pressure

    A. Harada, S. Kawasaki, H. Mukuda, Y. Kitaoka, Y. Haga, E. Yamamoto, Y. Onuki, K. M. Itoh, E. E. Haller, H. Harima

    PHYSICAL REVIEW B   75 ( 14 )   140502-1-140502-4   2007.4

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    We report that a different type of superconducting order parameter has been realized in the ferromagnetic states in UGe2 via Ge-73-nuclear-quadrupole-resonance experiments performed under pressure (P). Measurements of the nuclear spin-lattice relaxation rate (1/T-1) have revealed an unconventional nature of superconductivity such that the up-spin band is gapped with line nodes, but the down-spin band remains gapless at the Fermi level. This result is consistent with that of a ferromagnetic spin-pairing model in which Cooper pairs are formed among ferromagnetically polarized electrons. The present experiment has shed light on the possible origin of ferromagnetic superconductivity, which is mediated by ferromagnetic spin-density fluctuations relevant to the first-order transition inside the ferromagnetic states.

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  • Pressure-induced antiferromagnetic superconductivity in CeNiGe3: A 73Ge-NQR study under pressure

    A. Harada, S. Kawasaki, H. Mukuda, Y. Kitaoka, A. Thamizhavel, Y. Okuda, R. Settai, Y. Onuki, K. M. Itoh, E. E. Haller, H. Harima

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   614 - 616   2007.3

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    We report on antiferromagnetic (AF) properties of pressure-induced superconductivity in CeNiGe3 via the Ge-73 nuclear-quadrupole-resonance (NQR) measurements under pressure (P). The NQR-spectrum measurements have revealed that the incommensurate antiferromagnetic ordering is robust against increasing P with the increase of ordered moment and ordering temperature. Nevertheless the measurements of nuclear spin-lattice relaxation rate (1/T-1) have pointed to the onset of superconductivity as a consequence of Ce-4f electrons delocalized by applying P. The emergence of superconductivity under the development of AF order suggests that a novel type of superconducting mechanism works in this compound. (c) 2006 Elsevier B. V. All rights reserved.

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  • In-115-NQR study of CeRh1-xIrxIn5 under pressure

    Y. Mugino, S. Kawasaki, M. Yashima, H. Mukuda, Y. Kitaoka, H. Shishido, Y. Onuki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   584 - 586   2007.3

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    We report on pressure-induced evolutions of antiferromagnetic spin. fluctuations (AFM-SFs) and unconventional superconductivity on the x = 0.6 sample in a series of compounds CeRh1-xIrxIn5 via the (115) In nuclear-quadrupole-resonance ( NQR) experiment. The In-NQR 1/T-1 measurements have revealed that the slight application of pressure makes T-c 0.9K at P = 0 increase up to Tc 1.06K at P = 0.47 GPa. Concomitantly, the character of AFM-SF evolves from an isotropic regime to an anisotropic one as P increases. These results suggest that AFM-SFs play vital role in mediating the strong-coupling superconductivity in CeRh1-xIrxIn5. (c) 2006 Elsevier B.V. All rights reserved.

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  • Ge-73-NQR study of heavy-fermion compound CeNi2Ge2

    S. Kawasaki, T. Sada, T. Miyoshi, H. Kotegawa, H. Mukuda, Y. Kitaoka, T. C. Kobayashi, T. Fukuhara, K. Maezawa, K. M. Itoh, E. E. Haller

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   590 - 592   2007.3

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    We report 73 Ge-nuclear-quadrupole resonance (NQR) study of heavy-fermion compound CeNi2Ge2. The temperature dependence of the 73 Ge nuclear-spin-lattice-relaxation rate 1/T-1 indicates the development of magnetic correlations and the formation of a Fermi-liquid state at temperatures lower than T-FL 0.4K, where 1/T1T is constant. The 1/T1T decrease below T(NQR)c 0.1K, whereas resistance decreases below T (onset)c = 0.2K and does not become zero. These results indicate CeNi2Ge2 closely locates to a superconducting quantum critical point. (c) 2006 Elsevier B. V. All rights reserved.

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  • Novel phase diagram of antiferromagnetism and superconductivity in CeRhIn5

    M. Yashima, S. Kawasaki, H. Mukuda, Y. Kitaoka, H. Shishido, R. Settai, Y. Onuki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   322 - 324   2007.3

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    We report on the pressure (P)-induced phase diagram of antiferromagnetism (AFM) and superconductivity (SC) which emerges at their border at zero magnetic. field. The nuclear-quadrupole- resonance (NQR) measurements have revealed that AFM can take place in the superconducting state with Tc similar to 2.1K at P 2.05 GPa. The present experiments have, for the. first time, demonstrated that AFM phase, AFM + SC uniformly coexisting phase, SC phase and paramagnetic phase all contact with each other at T-tetra similar to 2.1K and Ptetra similar to 2GPa which evidence the existence of the tetracritical point in the P-T phase diagram of AFM and SC in CeRnIn5. (c) 2006 Elsevier B.V. All rights reserved.

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  • Novel superconductivity at the magnetic critical point in heavy-fermion systems: a systematic study of NQR under pressure Invited Reviewed

    Y. Kitaoka, S. Kawasaki, Y. Kawasaki, T. Mito, G-q Zheng

    JOURNAL OF PHYSICS-CONDENSED MATTER   19 ( 12 )   125202-1-125202-18   2007.3

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    We report on the discovery of exotic superconductivity (SC) and novel magnetism in heavy-fermion (HF) compounds, CeCu2Si2, CeRhIn5 and CeIn3, on the verge of antiferromagnetism (AFM) through nuclear-quadrupole-resonance (NQR) measurements under pressure (P). The exotic SC in a homogeneous CeCu2Si2 (T-c = 0.7 K) revealed antiferromagnetic critical fluctuations at the border to AFM or a marginal AFM. Remarkably, it has been found that the application of magnetic field induces a spin-density-wave (SDW) transition by suppressing the SC near the upper critical field. Furthermore, the uniform mixed phase of SC and AFM in CeCu2(Si1-xGex)(2) emerges on a microscopic level, once a tiny amount of 1% Ge (x = 0.01) is substituted for Si to expand its lattice. The application of minute pressure (P similar to 0.19 GPa) suppresses the sudden emergence of the AFM caused by doping Ge. The persistence of the low-lying magnetic excitations at temperatures lower than T-c and T-N is ascribed to the uniform mixed phase of SC and AFM.
    Likewise, the P-induced HF superconductor CeRhIn5 coexists with AFM on a microscopic level in P = 1.5-1.9 GPa. It is demonstrated that SC does not yield any trace of gap opening in low-lying excitations below the onset temperature, presumably associated with an amplitude fluctuation of superconducting order parameter. The unconventional gapless nature of SC in the low-lying excitation spectrum emerges due to the uniform mixed phase of AFM and SC.
    By contrast, in CeIn3, the P-induced phase separation of AFM and paramagnetism (PM) takes place without any trace for a quantum phase transition. The outstanding finding is that SC sets in at both the phases magnetically separated into AFM and PM in P = 2.28-2.5 GPa. A new type of SC forms the uniform mixed phase with AFM and the HF SC occurs in PM. We propose that the magnetic excitations such as spin-density fluctuations induced by the first-order phase transition from AFM to PM might mediate attractive interaction to form the Cooper pairs in the novel phase of AFM.

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  • Evidence for point nodes in the superconducting gap function in the filled skutterudite heavy-fermion compound PrOs4Sb12 : Sb-123-NQR study under pressure Reviewed

    Kouta Katayama, Shinji Kawasaki, Masahide Nishiyama, Hitoshi Sugawara, Daisuke Kikuchi, Hideyuki Sato, Guo-qing Zheng

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 2 )   023701-1-023701-4   2007.2

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    We report Sb-123 nuclear quadrupole resonance (NQR) measurements of the filled skutterudite heavy-fermion superconductor PrOs4Sb12 under high pressures of 1.91 and 2.34GPa. The temperature dependence of NQR frequency and the spin-lattice relaxation rate 1/T-1 indicate that the crystal-electricfield splitting Delta(CEF) between the ground state Gamma(1) singlet and the first excited state Gamma((2))(4) triplet decreases with increasing pressure. The 1/T-1 below T-c = 1.55 K at P = 1.91 GPa shows a power-law temperature variation and is proportional to T-5 at temperatures considerably below T,, which indicates the existence of Point nodes in the superconducting gap function. The data can be well fitted by the gap model Delta(theta) = Delta(0) sin theta with Delta(0) = 3.08k-B T-c. The relation between the superconductivity and the quadrupole fluctuations associated with the 1,(2) state is discussed.

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  • Unconventional superconductivity and antiferromagnetic quantum criticality in CeRh1-xIrxIn5

    S. Kawasaki, M. Yashima, Y. Mugino, H. Mukuda, Y. Kitaoka, H. Shishido, Y. Onuki

    PHYSICA B-CONDENSED MATTER   378-80   400 - 401   2006.5

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    We report on chemical-substitution-induced evolution of magnetic correlations and unconventional superconductivity (SC) in CeRh1-xIrxIn5 via the In-115 nuclear-quadrupole-resonance (NQR) measurements. It is revealed that the chemical substitution of Rh for Ir enhances markedly antiferromagnetic (AFM) spin fluctuations and superconducting transition temperature T-c. The temperature dependence of nuclear spin-lattice relaxation rate 1/T-1 for x = 0.7 revealing a highest T-c = 1.2 K is interpreted by the anisotropic AFM spin fluctuations model that predicts a relation of T1T alpha (T + theta()3/4) with theta similar to 0. This indicates that the AFM quantum critical spin fluctuations are dominant in the normal state and then enhances T, through the strong coupling effect of pairing interaction for x = 0.7. (c) 2006 Elsevier B.V. All rights reserved.

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  • Evidence for the first-order phase transition from antiferromagnetism to paramagnetism in CeRhIn5

    M. Yashima, S. Kawasaki, Y. Kitaoka, H. Shishido, R. Settei, Y. Onuki

    PHYSICA B-CONDENSED MATTER   378-80   94 - 95   2006.5

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    The systematic and comprehensive NQR experiments near P-c are reported to address an intimate interplay between superconductivity (SC) and antiferromagnetism (AFM) of antiferromagnetic heavy-fermion compounds CeRhIn5 via the nuclear-quadrupole-resonance (NQR) measurements under pressure (P). The extensive measurements of In-NQR spectrum have revealed that a first-order transition occurs from the coexistent phase of AFM and SC to the single phase of SC at a critical pressure P-c approximate to 2GPa. (c) 2006 Elsevier B.V. All rights reserved.

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  • Unconventional superconductivity in the itinerant ferromagnet UGe2 : Ge-73-NQR study under pressure

    A Harada, S Kawasaki, H Mukuda, Y Kitaoka, Y Haga, E Yamamoto, Y Onuki, KM Itoh, EE Haller, H Harima

    PHYSICA B-CONDENSED MATTER   378-80   963 - 964   2006.5

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    The superconducting characteristics on the itinerant ferromagnetic superconductor UGe2 have been investigated via the Ge-73-NQR measurements under pressure (P) near the critical pressure P, where the first-order transition takes place from the low-temperature (1) and low-P ferromagnetic phase (FM2) to high-T and high-P one (FM 1). The measurements Of nuclear spin-lattice relaxation rate 1/T-1 have revealed a power-law like behavior as P without the coherence peak, whereas at low temperatures. it deviates from the P dependence to a T-linear like behavior. These results that depend on the pressure are well understood in terms Of non-unitary spin-triplet pairing state where the ferromagnetic up-spin band is gapped, but the down-spin band remains gapless at the Fermi level. We will argue an intimate relationship of the onset of SC with FM1 and FM2. (c) 2006 Elsevier B.V. All rights reserved.

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  • Evidence for unconventional superconducting fluctuations in heavy-fermion compound CeNi2Ge2

    S Kawasaki, T Sada, T Miyoshi, H Kotegawa, H Mukuda, TC Kobayashi, T Fukuhara, K Maezawa, KM Itoh, EE Haller

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 4 )   2006.4

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    We present evidence for unconventional superconducting fluctuations in a heavy-fermion compound CeNi2Ge2. The temperature dependence of the Ge-73 nuclear-spin-lattice-relaxation rate 1/T-1 indicates the development of magnetic correlations and the formation of a Fermi-liquid state at temperatures lower than T-FL = 0.4 K, where 1/T1T is constant. The resistance and 1/T1T measured on an as-grown sample decrease below 7(c)(onset) = 0.2 K and T-c(NQR) = 0.1 K, respectively: these are indicative of the onset of superconductivity. However, after annealing the sample to improve its quality. these superconducting signatures disappear. These results are consistent with the emergence of unconventional superconducting fluctuations in close proximity to a quantum critical point from the superconducting to the normal phase in CeNi2Ge2.

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  • Enhancing the superconducting transition temperature of CeRh1-xIrxIn5 due to the strong-coupling effects of antiferromagnetic spin fluctuations: An In-115 nuclear quadrupole resonance study

    S Kawasaki, M Yashima, Y Mugino, H Mukuda, Y Kitaoka, H Shishido, Y Onuki

    PHYSICAL REVIEW LETTERS   96 ( 14 )   2006.4

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    We report on systematic evolutions of antiferromagnetic (AFM) spin fluctuations and unconventional superconductivity (SC) in heavy-fermion (HF) compounds CeRh1-xIrxIn5 via an In-115 nuclear-quadrupole-resonance experiment. The nuclear spin-lattice relaxation rate 1/T-1 has revealed the marked development of AFM spin fluctuations as approaching an AFM ordered state. Concomitantly, the superconducting transition temperature T-c and the energy gap Delta(0) increase drastically from T-c=0.4 K and 2 Delta(0)/k(B)T(c)=5 in CeIrIn5 up to T-c=1.2 K and 2 Delta(0)/k(B)T(c)=8.3 in CeRh0.3Ir0.7In5, respectively. The present work suggests that the AFM spin fluctuations in close proximity to the AFM quantum critical point are indeed responsible for the strong-coupling unconventional SC in HF compounds.

    DOI: 10.1103/PhysRevLett.96.147001

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  • In-115-NQR study of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3 under pressure

    S Kawasaki, M Yashima, H Kotegawa, T Mito, Y Kawasaki, GQ Zheng, Y Kitaoka, H Shishido, S Araki, D Aoki, Y Haga, R Settai, Y Onuki

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   67 ( 1-3 )   497 - 499   2006.1

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    We report the novel phase diagram of superconductivity (SC) and anti ferromagnetism (AFM) in heavy-fermion (HF) pressure(P)-induced superconductors CeRhIn5 and CeIn5 through nuclear-quadrupole-resonance (NQR) measurements under P. The P-induced superconductivity in CeRhIn5 coexists with AFM on a microscopic level in P = 1.5-1.9 GPa. By contrast, in CeIn3, the P-induced phase separation of AFM and paramagnetism (PM) takes place without any trace of a quantum phase transition. The outstanding finding is that SC sets in at both the phases magnetically separated into AFM and PM in P=2.28-2.5 GPa. (c) 2005 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jpcs.2005.10.043

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  • Cooperative phenomenon of ferromagnetism and unconventional superconductivity in UGe2: A Ge-73-NQR study under pressure

    A Harada, S Kawasaki, H Kotegawa, Y Kitaoka, Y Haga, E Yamamoto, Y Onuki, KM Itoh, EE Haller, H Harima

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 10 )   2675 - 2678   2005.10

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    We report on a cooperative phenomenon of ferromagnetism and unconventional superconductivity (SC) in UGe2 through the measurements of Ge-73 nuclear-quadrupole-resonance (NQR) under pressure (P). The NQR spectra evidenced phase separation into ferromagnetic and paramagnetic phases in the vicinity of P-c similar to 1.5 GPa, pointing to a first-order transition. The measurements of nuclear-spin-lattice-relaxation-rate I/T-1 revealed that SC emerges under the background of ferromagnetism, but not of the paramagnetic phase.

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  • In-115-NQR study of antiferromagnetism and superconductivity near magnetic criticality in CeIn3

    S Kawasaki, T Mito, Y Kawasaki, H Kotegawa, GQ Zheng, Y Kitaoka, H Shishido, S Araki, R Settai, Y Onuki

    PHYSICA B-CONDENSED MATTER   359   413 - 415   2005.4

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    We report the discovery of novel phases in CeIn3 on the verge of antiferromagnetism (AFM) through the In-nuclear quadrupole resonance (NQR) measurements. We have found that even though a pressure (P)-induced phase separation into AFM and paramagnetism (PM) takes place, a novel superconductivity (SC), which is induced without strong spin fluctuations, has been found to coexist with AFM on a microscopic level. We propose that the magnetic excitations such as spin-density fluctuations induced by the first-order magnetic phase transition might mediate attractive interaction to form Cooper pairs. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2005.01.083

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  • Unconventional superconductivity near the antiferromagnetic criticality in CeCoIn5 : a study of In-115-NQR under pressure

    M Yashima, S Kawasaki, Y Kawasaki, GQ Zheng, Y Kitaoka, H Shishido, R Settai, Y Haga, Y Onuki

    PHYSICA B-CONDENSED MATTER   359   404 - 406   2005.4

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    We report on a systematic evolution of the superconducting (SC) characteristics of CeCoIn5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The application of P significantly suppresses the nuclear spin-lattice relaxation rate 1/T-1 that is dominated by antiferromagnetic (AFM) spin fluctuations (SFs). The marked suppression of AFM SFs leads to the reduction in the size of SC energy gap. Nevertheless, T-c increases with the pressure due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2005.01.080

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  • NMR/NQR experiments on heavy-fermion systems and superconductors

    Y Kitaoka, S Kawasaki, Y Kawasaki, H Kotegawa, T Mito

    PHYSICA B-CONDENSED MATTER   359   341 - 348   2005.4

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    We review the current NMR/NQR studies on superconducting and magnetic phases close to the magnetic instability under pressure (P) in heavy-fermion (HF) systems. In this article, by means of NQR studies, we highlight the novel phase diagrams of magnetism and superconductivity (SC) in the HF antiferromagnets CeCu2Si2, CeRhIn5, CeIn3, and the itinerant ferromagnet UGe2. A new light is shed on the difference and common features on the interplay between magnetism and SC. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2005.01.057

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  • The phase diagram of antiferromagnetism and superconductivity in CeRhIn5: a study of In-115 NQR under pressure

    S Kawasaki, M Yashima, T Mito, Y Kawasaki, GQ Zheng, Y Kitaoka, D Aoki, Y Haga, Y Onuki

    JOURNAL OF PHYSICS-CONDENSED MATTER   17 ( 11 )   S889 - S893   2005.3

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    We report on the pressure (P) versus temperature (T) phase diagram of the P-induced heavy fermion (HF) superconductor CeRhIn5 via nuclear quadrupole resonance (NQR) measurements under P. At P = 2.1 GPa, the T dependence of the nuclear spin-lattice relaxation rate 1/T-1 revealed antiferromagnetic critical fluctuations due to the closeness of antiferromagnetism. As P decreases slightly down to 1.9 GPa, a pseudogap emerges above T-c similar to 2 K, suggesting the appearance of superconducting fluctuations associated with a strong coupling effect among quasiparticles.

    DOI: 10.1088/0953-8984/17/11/019

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  • Novel phase diagram of superconductivity and ferromagnetism in UGe2: a Ge-73-NQR study under high pressure

    Y Kitaoka, H Kotegawa, A Harada, S Kawasaki, Y Kawasaki, Y Haga, E Yamamoto, Y Onuki, KM Itoh, EE Haller, H Harima

    JOURNAL OF PHYSICS-CONDENSED MATTER   17 ( 11 )   S975 - S986   2005.3

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    We report on the pressure- induced novel phases of ferromagnetism (FM) and superconductivity (SC) in the itinerant ferromagnet UGe2 through Ge-73-NQR measurements under pressure (P). The P dependence of the NQR spectrum points to a first-order transition from strongly to weakly polarized ferromagnetic phases (SP and WP) around a critical pressure of P-c(*) similar to 1.2 GPa. Furthermore, it shows the phase separation into the ferromagnetic and paramagnetic phases around P-c similar to 1.6 GPa. SC exhibiting a maximum value of the superconducting transition temperature T-sc similar to 0.7 K at P-c(*) similar to 1.2 GPa was found to take place in connection with a P-induced first-order transition from SP to WP The measurement of nuclear spin lattice relaxation rate 1/T-1 has probed the ferromagnetic transition, exhibiting a peak at the Curie temperature as well as a decrease without the coherence peak below T-sc. These results reveal the uniformly coexistent phase of FM and unconventional SC with a line-node gap. Around P-c where the FM disappears, it is shown that SC occurs under the background of FM, but not in the paramagnetic phase. We remark on an intimate interplay between the onset of SC and the underlying electronic state for SP and WP.

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  • Evidence for uniform coexistence of ferromagnetism and unconventional superconductivity in UGe2: A Ge-73-NQR study under pressure

    H Kotegawa, A Harada, S Kawasaki, Y Kawasaki, Y Kitaoka, Y Haga, E Yamamoto, Y Onuki, KM Itoh, EE Haller, H Harima

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 2 )   705 - 711   2005.2

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    We report on the itinerant ferromagnetic superconductor UGe2 through Ge-73-NQR measurements under pressure (P). The P dependence of the NQR spectrum signals a first-order transition from the low-temperature (T) and low-P ferromagnetic phase (FM2) to high-T and high-P one (FM1) around a critical pressure of P-x similar to 1.2 GPa. The superconductivity exhibiting a maximum value of T-sc = 0.7 K at P-x similar to 1.2 GPa, was found to take place in connection with the P-induced first-order transition. The nuclear spin-lattice relaxation rate 1/T-1 has probed the ferromagnetic transition, exhibiting a peak at the Curie temperature as well as a decrease without the coherence peak below T-sc. These results reveal the uniformly coexistent phase of ferromagnetism and unconventional superconductivity with a line-node gap. We remark on an intimate interplay between the onset of superconductivity and the underlying electronic state for the ferromagnetic phases.

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  • Enhancing the superconducting transition temperature of the heavy fermion compound CeIrIn5 in the absence of spin correlations

    S Kawasaki, GQ Zheng, H Kan, Y Kitaoka, H Shishido, Y Onuki

    PHYSICAL REVIEW LETTERS   94 ( 3 )   2005.1

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    We report on a pressure- (P-)induced evolution of superconductivity and spin correlations in CeIrIn5 via the In-115 nuclear-spin-lattice-relaxation rate measurements. We find that applying pressure suppresses dramatically the antiferromagnetic fluctuations that are strong at ambient pressure. At P=2.1 GPa, T-c increases to T-c=0.8 K, which is twice T-c (P=0 GPa), in the background of Fermi-liquid state. This is in sharp contrast to the previous case in which a negative, chemical pressure (replacing Ir with Rh) enhances magnetic interaction and increases T-c. Our results suggest that multiple mechanisms work to produce superconductivity in the same compound CeIrIn5.

    DOI: 10.1103/PhysRevLett.94.037007

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  • Unconventional superconductivity in heavy-fermion systems

    Y Kitaoka, S Kawasaki, T Mito, Y Kawasaki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 1 )   186 - 199   2005.1

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    We review the studies on the emergent phases of superconductvity and magnetism in the f-electron derived heavy-fermion (HF) systems by means of the nuclear-quadrupole-resonance (NQR) under pressure. These studies have unraveled a rich variety of the phenomena in the ground state of HF systems. In this article, we highlight the novel phase diagrams of magnetism and unconventional superconductivity (SC) in CeCu2Si2, HF antiferromagnets CeRhIn5, and CeIn3. A new light is shed on the difference and common features on the interplay between magnetism and SC on the magnetic criticality.

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  • New superconducting and magnetic phases emerge on the magnetic criticality in CeIn3 Reviewed

    S Kawasaki, T Mito, Y Kawasaki, H Kotegawa, GQ Zheng, Y Kitaoka, H Shishido, S Araki, R Settai, Y Onuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 7 )   1647 - 1650   2004.7

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    We report the discovery of new superconducting and novel magnetic phases in CeIn3 on the verge of antiferromagnetism (AFM) under pressure (P) through the In-nuclear quadrupole resonance (NQR) measurements. We have found a P-induced phase separation of AFM and paramagnetism (PM) without any trace of a quantum phase transition in CeIn3. A new type of superconductivity (SC) was found, under P = 2.28-2.5 GPa, to coexist with AFM. It is magnetically separated from PM where the heavy fermion SC takes place. We propose that the magnetic excitations such as spin-density fluctuations induced by the first-order magnetic phase transition might mediate attractive interaction to form Cooper pairs.

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  • Exotic superconductivity in the coexistent phase of antiferromagnetism and superconductivity in CeCu<inf>2</inf>(Si<inf>0.98</inf>Ge<inf>0.02</inf>) <inf>2</inf>: A Cu-NQR study under hydrostatic pressure

    Yu Kawasaki, Kenji Ishida, Shinji Kawasaki, Takeshi Mito, Guo Qing Zheng, Yoshio Kitaoka, Christoph Geibel, Frank Steglich

    Journal of the Physical Society of Japan   73 ( 1 )   194 - 197   2004.1

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    We report a pressure (P) effect on CeCu2(Si 0.98Ge0.02)2 where an antiferromagnetic (AFM) order at TN ∼ 0.75 K coexists with superconductivity below T c ∼ 0.4 K. At pressures exceeding P = 0.19 GPa, the AFM order is suppressed, which demonstrates that the sudden emergence of AFM order due to the Ge doping is ascribed to the intrinsic lattice expansion. The exotic superconductivity at P = 0 GPa is found to evolve into a typical heavy-fermion one with a line-node gap above P = 0.91 GPa. We highlight that the anomalous enhancement in nuclear spin-lattice relaxation rate 1/T1 that follows a T1T = const. behavior well below Tc at P = 0 GPa is characterized by the persistence of low-lying magnetic excitations, which may be inherent to the coexistent state of antiferromagnetism and superconductivity. ©2004 The Physical Society of Japan.

    DOI: 10.1143/JPSJ.73.194

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  • Gapless magnetic and quasiparticle excitations due to the coexistence of antiferromagnetism and superconductivity in CeRhIn5: A study of In-115 NQR under pressure Reviewed

    S Kawasaki, T Mito, Y Kawasaki, GQ Zheng, Y Kitaoka, D Aoki, Y Haga, Y Onuki

    PHYSICAL REVIEW LETTERS   91 ( 13 )   137001   2003.9

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    We report systematic measurements of ac susceptibility, nuclear-quadrupole-resonance spectrum, and nuclear-spin-lattice-relaxation time (T-1) on the pressure (P)-induced heavy-fermion superconductor CeRhIn5. The temperature (T) dependence of 1/T-1 at P=1.6 GPa has revealed that antiferromagnetism (AFM) and superconductivity (SC) coexist microscopically, exhibiting the respective transition at T-N=2.8 K and T-c(MF)=0.9 K. It is demonstrated that SC does not yield any trace of gap opening in low-lying excitations below T-c(onset)=2 K, but T-c(MF)=0.9 K, followed by a T1T=const law. These results point to the unconventional characteristics of SC coexisting with AFM. We highlight that both of the results deserve theoretical work on the gapless nature in the low-lying excitation spectrum due to the coexistence of AFM and SC and the lack of the mean-field regime below T-c(onset)=2 K.

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  • Anisotropic spin fluctuations in heavy-fermion superconductor CeCoIn5: In-NQR and Co-NMR studies Reviewed

    Y Kawasaki, S Kawasaki, M Yashima, T Mito, GQ Zheng, Y Kitaoka, H Shishido, R Settai, Y Haga, Y Onuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   72 ( 9 )   2308 - 2311   2003.9

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    We report In-NQR and Co-NMR experiments of CeCoIn5 that undergoes a superconducting transition with a record high T-c = 2.3 K to date among heavy-fermion superconductors. At zero magnetic field, an anomalous temperature (T) dependence of nuclear spin-lattice relaxation rate 1/T-1 of In-115 is explained by the relation 1/T-1 proportional to T (.) chi(Q)(T)(3/4) based on the anisotropic spin-fluctuations model in case of the proximity to an antiferromagnetic (AFM) quantum critical point (QCP). The novel behavior of 1/T-1 similar to T-1/4 over a wide T range of T-c &lt; T &lt; 40 K arises because the staggered susceptibility almost follows the Curie law chi(Q)(T) proportional to 1/(T + theta) with theta = 0.6 K and hence 1/T-1 proportional to T/(T + 0.6)(3/4) similar to T-1/4 for theta &lt; T. We highlight that the behavior 1/T-1 similar to T-1/4 is due to the proximity to the anisotropic AFM QCP relevant with. its layered structure, and is not associated with the AFM QCP for isotropic 3D systems. We have also found that the AFM spin fluctuations in CeCoIn5 are suppressed by small magnetic field so that theta = 0.6 K at H = 0 increases to theta = 2.5 K at H = 1.1 T, reinforcing that CeCoIn5 is closely located at the QCP.

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  • Unconventional superconductivity in ferromagnetic UGe2: a Ge-73 nuclear magnetic resonance/nuclear quadrupole resonance study Reviewed

    H Kotegawa, S Kawasaki, A Harada, Y Kawasaki, K Okamoto, GQ Zheng, Y Kitaoka, E Yamamoto, Y Haga, Y Onuki, KM Itoh, EE Haller

    JOURNAL OF PHYSICS-CONDENSED MATTER   15 ( 28 )   S2043 - S2046   2003.7

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    We report Ge-73 nuclear magnetic resonance/nuclear quadrupole resonance (NMR/NQR) measurements on the itinerant ferromagnetic superconductor UGe2 at ambient pressure (P = 0) and P = 1.3 GPa. Measurements of the nuclear spin-lattice relaxation rate 1/T-1 of the Ge-73 NMR at P = 0 have revealed a T1T = constant behaviour well below T-Curie = 52 K, evidencing the presence of a non-zero density of states at the Fermi level for the up-and down-spin bands in the ferromagnetic state. At P = 1.3 GPa, where the ferromagnetic transition is reduced to T-Curie = 26 K, the dependence on temperature (T) of NQR 1/T-1 at zero field has demonstrated the onset of the superconducting transition at T, = 0.55 K. The lack of a coherence peak in (1/T-1) just below T,, followed by a T-3-like behaviour, provide compelling evidence for the unconventional nature of the superconducting state that coexists with the ferromagnetic state on a microscopic scale in UGe2.

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  • Unconventional superconductivity in CeIn3: In-115-NQR study under pressure Reviewed

    S Kawasaki, Y Kawasaki, T Mito, GQ Zheng, Y Kitaoka, S Araki, R Settai, Y Onuki

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   388   541 - 542   2003.5

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    We report evidences for bulk nature and unconventional superconductivity in CeIn3 at P = 2.65 GPa revealed by the measurements of nuclear-spin-lattice-relaxation time (T-1) and ac-susceptibility (ac-chi). Both the measurements of ac-chi and T, have pointed to a superconducting transition at T = 95 mK, which is very much lower than an onset temperature T-onset = 0.15 K at zero resistance. The temperature dependence of 1/T-1 shows no coherence peak just below T-c, indicative of an unconventional nature for the superconductivity. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4534(02)02732-6

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  • Magnetism and superconductivity in CeRhIn5 under chemical and hydrostatic pressures Reviewed

    Zheng GQ, Kawasaki S, Yamaguchi N, Tanabe K, Mito T, Kan H, Kitaoka Y, Haga Y, Aoki D, Onuki Y, Sarrao JL, Thompson JD

    Physica B   329 ( II )   450 - 451   2003.5

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    Nuclear quadrupolar resonance measurements find that, under hydrostatic or chemical pressure, the heavy fermion antiferromagnet CeRhIn5 becomes more itinerant and the Neel temperature TN increases slightly at low pressures but decreases at large pressures. In CeRh0.5Ir0.5In 5, unconventional superconductivity sets in well below T N, with enhanced Tc ≈ 1 K. © 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02001-X

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  • Magnetic properties of CeRhIn5 under pressure probed by In-115-NQR Reviewed

    S. Kawasaki, T. Mito, G.Q. Zheng, Y. Kawasaki, Y. Kitaoka, D. Aoki, Y. Haga, Y. Onuki

    Acta Phys. Pol. B   34 ( 2 )   419   2003.2

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  • Coexistence of antiferromagnetism and superconductivity near the quantum criticality of the heavy-fermion compound CeRhIn5 Reviewed

    T. Mito, S. Kawasaki, Y. Kawasaki, G. -q. Zheng, Y. Kitaoka, D. Aoki, Y. Haga, Y. Onuki

    Phys. Rev. Lett.   90 ( 7 )   077004-1 - 4   2003.2

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  • Unconventional superconductivity and quasi-2D magnetic fluctuations in Ce(Ir,Rh)In-5 Reviewed

    G.Q. Zheng, K. Tanabe, S. Kawasaki, H. Kan, Y. Kitaoka, D. Aoki, Y. Haga, Y. Onuki

    Acta Phys. Pol. B   34 ( 2 )   435   2003.2

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  • Coexistence of Antiferromagnetism and Superconductivity near the Quantum Criticality of the Heavy-Fermion Compound [Formula presented] Reviewed

    T. Mito, S. Kawasaki, Y. Kawasaki, G. Zheng, Y. Kitaoka, D. Aoki, Y. Haga, Y. Ōnuki

    Physical Review Letters   90 ( 7 )   4   2003

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    We report a study on the interplay between antiferromagnetism (AFM) and superconductivity (SC) in a heavy-fermion compound [Formula presented] under pressure [Formula presented]. The onset of the magnetic order is evidenced from a clear split of [Formula presented] nuclear quadrupole resonance spectrum due to the spontaneous internal field below the Néel temperature [Formula presented]. Simultaneously, bulk SC below [Formula presented] is demonstrated by the observation of the Meissner diamagnetism signal whose size is the same as in the exclusively superconducting phase. These results indicate that the AFM coexists homogeneously with the SC at a microscopic level. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevLett.90.077004

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  • Gapless magnetic and quasiparticle excitations due to the coexistence of antiferromagnetism and superconductivity in [formula presented]: A study of [formula presented] NQR under pressure Reviewed

    S. Kawasaki, T. Mito, Y. Kawasaki, G. q. Zheng, Y. Kitaoka, D. Aoki, Y. Haga, Y. Ōnuki

    Physical Review Letters   91 ( 13 )   2003

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    We report systematic measurements of ac susceptibility, nuclear-quadrupole-resonance spectrum, and nuclear-spin-lattice-relaxation time ([Formula presented]) on the pressure ([Formula presented])-induced heavy-fermion superconductor [Formula presented]. The temperature ([Formula presented]) dependence of [Formula presented] at [Formula presented] has revealed that antiferromagnetism (AFM) and superconductivity (SC) coexist microscopically, exhibiting the respective transition at [Formula presented] and [Formula presented]. It is demonstrated that SC does not yield any trace of gap opening in low-lying excitations below [Formula presented], but [Formula presented], followed by a [Formula presented] law. These results point to the unconventional characteristics of SC coexisting with AFM. We highlight that both of the results deserve theoretical work on the gapless nature in the low-lying excitation spectrum due to the coexistence of AFM and SC and the lack of the mean-field regime below [Formula presented]. © 2003 The American Physical Society.

    DOI: 10.1103/PhysRevLett.91.137001

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  • <sup>115</sup>In-NQR evidence for unconventional superconductivity in CeIn<inf>3</inf> under pressure

    S. Kawasaki, T. Mito, Y. Kawasaki, G. Q. Zheng, Y. Kitaoka, H. Shishido, S. Araki, R. Settai, Y. Onuki

    Physical Review B - Condensed Matter and Materials Physics   66 ( 5 )   545211 - 545214   2002.8

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    We report evidence for unconventional superconductivity in CeIn3 at a pressure P=2.65 GPa above the critical pressure (Pc∼2.5 GPa) revealed by measurements of the nuclear-spin-lattice-relaxation time (T1) and ac susceptibility (ac-x). Both measurements of T1 and ac-x have pointed to a superconducting transition at Tc=95 mK, which is much lower than the onset temperature Tonset=0.15 K at zero resistance. The temperature dependence of 1/T1 shows no coherence peak just below Tc, indicative of an unconventional nature for the superconductivity induced in CeIn3.

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  • In-115-NQR evidence for unconventional superconductivity in CeIn3 under pressure Reviewed

    S Kawasaki, T Mito, Y Kawasaki, GQ Zheng, Y Kitaoka, H Shishido, S Araki, R Settai, Y Onuki

    PHYSICAL REVIEW B   66 ( 5 )   054521   2002.8

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    We report evidence for unconventional superconductivity in CeIn3 at a pressure P=2.65 GPa above the critical pressure (P(c)similar to2.5 GPa) revealed by measurements of the nuclear-spin-lattice-relaxation time (T-1) and ac susceptibility (ac-chi). Both measurements of T-1 and ac-chi have pointed to a superconducting transition at T-c=95 mK, which is much lower than the onset temperature T-onset=0.15 K at zero resistance. The temperature dependence of 1/T-1 shows no coherence peak just below T-c, indicative of an unconventional nature for the superconductivity induced in CeIn3.

    DOI: 10.1103/PhysRevB.66.054521

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  • Systematic nqr study of the pressure-induced transition from antiferromagnetic to superconducting state in CeRhIn5 Reviewed

    T. Mito, S. Kawasaki, G. Q. Zheng, Y. Kawasaki, K. Ishida, Y. Kitaoka, D. Aoki, Y. Haga, Y. Onuki

    Physica B-Condensed Matter   312   16 - 18   2002.3

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  • Anisotropic Magnetic Fluctuations and Unconventional Superconductivity in the Layered Heavy Fermion Compound CeIrIn5 Reviewed

    Zheng Guo-qing, Tanabe Kenji, Kawasaki Shinji, Kitaoka Yoshio, Aoki Dai, Haga Yoshinori, Onuki Yoshichika

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71   279 - 281   2002.1

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    We report the 'In nuclear spin-lattice relaxation rate (1/T-1) measurements down to 90 mK in the new heavy fermion (HF) compound CeIrIn5. At 0.4 K <= T <= 100 K, 1/T-1 is strongly T-dependent, which indicates that the 4f electrons are much more itinerant than in known Ce-based HFs. From the unique temperature variation of 1/T1T, we find that this compound is located near a quantum critical point, with anisotropic spin fluctuations due to a layered crystal structure, Below the hulk superconductivity temperature 0.40 K, 1/T-1, follows a T-3 variation without a coherence peak, which indicates unconventional superconductivity with line-node gap. These aspects are reminiscent of the high-T-c copper oxides and suggest the importance of the magnetic fluctuations for the occurrence of the unconventional superconductivity

    DOI: 10.1143/JPSJS.71S.279

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  • Evolution of the Magnetism and Superconductivity in CeRhIn5 under Pressure: In-115-NQR Study Reviewed

    Kawasaki Shinji, Mito Takeshi, Zheng Guo-qing, Kawasaki Yu, Ishida Kenji, Kitaoka Yoshio, Aoki Dai, Haga Yoshinori, Onuki Yoshichika

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( SUPPL. )   282 - 284   2002.1

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    We report a novel pressure(P)-induced evolution on the magnetism in the P-induced superconductor CeRhlns revealed by measurements of the 115 In nuclear-spin-lattice-relaxation rate (1151/Ti). In the itinerant antiferromagnet CeRhln5 with the Néel temperature Tn = 3.8 K at P=0, Tn begins to be reduced to Tn = 3.6 K at P = 1.23 GPa that is close to the border of the superconducting phase. An emergent behavior is the observation of a pseudogap behavior that is revealed by a broad peak in the temperature dependence of 1/T1T at P = 1.23 GPa. With further increasing P up to P = 2.1 GPa where its bulk superconductivity is fully established, the pseudogap behavior is not seen in the normal state. The insensitive P dependence of Tc in CeRhln5 is suggested to be related to that of the characteristic temperature T which marks a localized to itinerant magnetic crossover. © 2002 1 he Physical bociety of Japan.

    DOI: 10.1143/JPSJS.71S.282

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  • Pressure-temperature phase diagram of antiferromagnetism and superconductivity in ceRhIn<inf>5</inf> and CeIn<inf>3</inf>: <sup>115</sup>In-NQR study under pressure

    S. Kawasaki, T. Mito, G. Q. Zheng, C. Thessieu, Y. Kawasaki, K. Ishida, Y. Kitaoka, T. Muramatsu, T. C. Kobayashi, D. Aoki, S. Araki, Y. Haga, R. Settai, Y. Ōnuki, Y. Ōnuki

    Physical Review B - Condensed Matter and Materials Physics   65 ( 2 )   205041 - 205044   2002.1

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    We report the pressure (P)-temperature (T) phase diagram of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3 revealed by the 115In nuclear-spin-lattice-relaxation (T1) measurement. In the itinerant magnet CeRhIn5, we found that the Néel temperature TN is reduced at P ≥ 1.23 GPa with an emergent pseudogap behavior. In CeIn3, the localized magnetic character is robust against the application of pressure up to P ∼ 1.9 GPa, beyond which the system evolves into an itinerant regime in which the resistive superconducting phase emerges. We discuss the relationship between the phase diagram and the magnetic fluctuations.

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  • Pressure-temperature phase diagram of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3: In-115-NQR study under pressure Reviewed

    S Kawasaki, T Mito, GQ Zheng, C Thessieu, Y Kawasaki, K Ishida, Y Kitaoka, T Muramatsu, TC Kobayashi, D Aoki, S Araki, Y Haga, R Settai, Y Onuki

    PHYSICAL REVIEW B   65 ( 2 )   020504(R)   2002.1

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    We report the pressure (P)-temperature (T) phase diagram of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3 revealed by the In-115 nuclear-spin-lattice-relaxation (T-1) measurement. In the itinerant magnet CeRhIn5, we found that the Neel temperature T-N is reduced at P greater than or equal to 1.23 GPa with an emergent pseudogap behavior. In CeIn3, the localized magnetic character is robust against the application of pressure up to Psimilar to1.9 GPa, beyond which the system evolves into an itinerant regime in which the resistive superconducting phase emerges. We discuss the relationship between the phase diagram and the magnetic fluctuations.

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  • Evolution of antiferromagntism and superconductivity in CeRhIn5 under pressure.

    S. Kawasaki, T. Mito, G.-q. Zheng, Y. Kawasaki, K. Ishida, Y. Kitaoka, D. Aoki, S. Araki, Y. Haga, R. Settai, Y. Onuki

    J. Phys. Soc. Jpn.   2002

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  • (formula presented)-NQR evidence for unconventional superconductivity in (formula presented) under pressure Reviewed

    S. Kawasaki, T. Mito, Y. Kawasaki, G. Zheng, Y. Kitaoka, H. Shishido, S. Araki, R. Settai, Y. Ōnuki

    Physical Review B - Condensed Matter and Materials Physics   66 ( 5 )   1 - 4   2002

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    We report evidence for unconventional superconductivity in (formula presented) at a pressure (formula presented) above the critical pressure (formula presented) revealed by measurements of the nuclear-spin-lattice-relaxation time (formula presented) and ac susceptibility (ac- (formula presented) Both measurements of (formula presented) and ac- (formula presented) have pointed to a superconducting transition at (formula presented) which is much lower than the onset temperature (formula presented) at zero resistance. The temperature dependence of (formula presented) shows no coherence peak just below (formula presented) indicative of an unconventional nature for the superconductivity induced in (formula presented). © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevB.66.054521

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  • Pressure-temperature phase diagram of antiferromagnetism and superconductivity in (formula presented) and (formula presented) (formula presented) study under pressure Reviewed

    S. Kawasaki, T. Mito, G. Zheng, C. Thessieu, Y. Kawasaki, K. Ishida, Y. Kitaoka, T. Muramatsu, T. C. Kobayashi, D. Aoki, S. Araki, Y. Haga, R. Settai, Y. Onuki

    Physical Review B - Condensed Matter and Materials Physics   65 ( 2 )   1 - 4   2002

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    We report the pressure (formula presented)-temperature (formula presented) phase diagram of antiferromagnetism and superconductivity in (formula presented) and (formula presented) revealed by the (formula presented) nuclear-spin-lattice-relaxation (formula presented) measurement. In the itinerant magnet (formula presented) we found that the Néel temperature (formula presented) is reduced at (formula presented) with an emergent pseudogap behavior. In (formula presented) the localized magnetic character is robust against the application of pressure up to (formula presented) beyond which the system evolves into an itinerant regime in which the resistive superconducting phase emerges. We discuss the relationship between the phase diagram and the magnetic fluctuations. © 2001 The American Physical Society.

    DOI: 10.1103/PhysRevB.65.020504

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  • Coexistence of antiferromagnetism and superconductivity in heavy-fermion systems Reviewed

    Y. Kitaoka, Y. Kawasaki, T. Mito, S. Kawasaki, G. Zheng, K. Ishida, D. Aoki, Y. Haga, R. Settai, Y. Onuki, C. Geibel, F. Steglich

    Journal of Physics and Chemistry of Solids   63 ( 6-8 )   1141 - 1146   2002

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    DOI: 10.1016/S0022-3697(02)00133-6

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  • Pressure-induced anomalous magnetism and unconventional superconductivity in CeRhIn5: 115In-NQR study under pressure Reviewed

    T. Mito, S. Kawasaki, G-q. Zheng, Y. Kawasaki, K. Ishida, Y. Kitaoka, D. Aoki, Y. Haga, Y.Onuki

    Phys. Rev. B.   63 ( 22 )   220507-1 - 4   2001.6

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    We report 115In nuclear-quadrupole-resonance (NQR) measurements of the pressure(P)-induced superconductor CeRhIn5 in the antiferromagnetic (AF) and superconducting (SC) states. In the AF region, the internal field Hint at the In site is substantially reduced from Hint = 1.75 kOe at P = 0 to 0.39 kOe at P = 1.23 GPa, while the Néel temperature slightly changes with increasing P. This suggests that either the size in the ordered moment MQ(P) or the angle θ(P) between the direction of MQ(P) and the tetragonal c axis is extrapolated to zero at P* = 1.6±0.1 GPa at which a bulk SC transition is no longer- emergent. In the SC state at P =2.1 GPa, the nuclear spin-lattice relaxation rate 115(1/T1) has revealed a T3 dependence without the coherence peak just below Tc, giving evidence for the unconventional superconductivity. The dimensionality of the magnetic fluctuations in the normal state is also discussed.

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  • Unique spin dynamics and unconventional superconductivity in the layered heavy fermion compound CeIrIn5: NQR evidence Reviewed

    G-q. Zheng, K. Tanabe, T. Mito, S. Kawasaki, Y. Kitaoka, D. Aoki, Y. Haga, Y.Onuki

    Phys. Rev. Lett.   86 ( 20 )   4664 - 4667   2001.5

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    The nuclear spin relaxation rate between T=0.09 and 100K in a new heavy fermion (HF) compound was presented. The new HF compound was found to be more itinerant than known Cerium based HFs from the nuclear quadrupolar resonance (NQR) measurement. The bulk superconductivity was found setting in at 0.40K below which the coherence peak was absent thereby suggesting unconventional superconductivity with line-node gap.

    DOI: 10.1103/PhysRevLett.86.4664

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  • Pressure-induced anomalous magnetism and unconventional superconductivity in (formula presented) (formula presented)-NQR study under pressure Reviewed

    Y. Kawasaki, Y. Onuki, G. q. Zheng, K. Ishida, Y. Kitaoka, S. Kawasaki, T. Mito, D. Aoki, Y. Haga

    Physical Review B - Condensed Matter and Materials Physics   63 ( 22 )   2001

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    We report (formula presented) nuclear-quadrupole-resonance (NQR) measurements of the pressure (formula presented)-induced superconductor (formula presented) in the antiferromagnetic (AF) and superconducting (SC) states. In the AF region, the internal field (formula presented) at the In site is substantially reduced from (formula presented) at (formula presented) to 0.39 kOe at (formula presented) while the Néel temperature slightly changes with increasing P. This suggests that either the size in the ordered moment (formula presented) or the angle (formula presented) between the direction of (formula presented) and the tetragonal c axis is extrapolated to zero at (formula presented) at which a bulk SC transition is no longer emergent. In the SC state at (formula presented) the nuclear spin-lattice relaxation rate (formula presented) has revealed a (formula presented) dependence without the coherence peak just below (formula presented) giving evidence for the unconventional superconductivity. The dimensionality of the magnetic fluctuations in the normal state is also discussed. © 2001 The American Physical Society.

    DOI: 10.1103/PhysRevB.63.220507

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  • In-NQR study of CeIn3 under pressure Reviewed

    C Thessieu, K Ishida, S Kawasaki, T Mito, Y Kawasaki, GQ Zheng, Y Kitaoka, Y Onuki

    PHYSICA B   281   9 - 11   2000.6

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    In order to investigate the evolution of magnetic properties when the ground state changes from magnetism to superconductivity, we have performed In-NQR measurements under hydrostatic pressure in heavy-fermion antiferromagnetic compound, CeIn3. Peaks in the In-NQR spectra were shifted in the magnetically ordered state due to the appearance of the asymmetric parameter eta, which enables us to determine the ordering temperature T-N, precisely. T-N in our measurement is in good agreement with that from the resistivity measurement. Nuclear spin-lattice relaxation rate 1/T-1 increases gradually upon cooling in the paramagnetic state at pressure (P) smaller than 15 kbar, whereas 1/T-1 shows slightly decreasing behavior with decreasing T above T-N at P &gt; 15 kbar. It is suggested that the magnetic property at T-N may change from the localized to itinerant regime around 15 kbar, above which the Kondo temperature T-K is higher than T-N. (C) 2000 Elsevier Science B.V. All rights reserved.

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  • 銅酸化物高温超伝導体における擬ギャップと磁場誘起電荷密度波ーBi$_2$Sr$_{2-x}$La$_x$CuO$_6$の場合ー Invited Reviewed

    川崎慎司, 鄭国慶

    日本物理学会誌   73 ( 8 )   558 - 563   2018.8

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  • 27pCM-7 NMR study of the pseudogap ground state in single layered cuprate Bi_2Sr_<2-x>La_xCuO_<6+δ>

    Motoyama Takeshi, Kawasaki Shinji, Lin Chengtian, Zheng Guo-qing

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   568 - 568   2014.3

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  • 27aCE-9 NMR study of Sr_2VFeAsO_3 under pressure

    Ueshima K., Han F., Wen Hai-Hu, Kawasaki S., Zheng Guo-qing

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   545 - 545   2014.3

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  • NMR study of Sr_2VFeAsO_3

    Ueshima K., Han F., Wen Hai-Hu, Kawasaki S., Guo-qing Zheng

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   557 - 557   2013.8

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  • 29pXG-9 NMR study of Sr_2VFeAsO_3

    Ueshima K., Han F., Wen Hai-Hu, Kawasaki S., Zheng Guo-qing

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   722 - 722   2013.3

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  • 21aGA-3 As-NQR study of LaFeAsO_<1-x>F_x (VII)

    Oka T., Li Z., Kawasaki S., Zheng G. -q., Chen G. F., Wang N. L.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   581 - 581   2012.8

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  • 21aGA-13 NMR study of Sr_2VFeAsO_3

    Ueshima K., Han F, Wen Hai-Hu, Kawasaki S., Zheng G. -q., Zhu Xiyu

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   583 - 583   2012.8

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  • 19aGB-1 NMR study of SrPt_2As_2

    Tani Y., Kawasaki S., Nishikubo Y., Kudo K., Nohara M., Zheng G. -q.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   477 - 477   2012.8

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  • 25pBC-7 NMR study of the gapless superconducting state near a quantum critical point

    Kawasaki Shinji

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   842 - 842   2012.3

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  • 25aYB-3 In-NQR study of CeRh_<1-x>Ir_xIn_5 under pressure II

    Sorime A., Kawasaki S., Zheng G. -q., Sarrao J. L., Thmpson J. D.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   586 - 586   2012.3

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  • 25pYA-7 As-NQR study of LaFeAsO_<1-x>F_x (VI)

    Oka T., Li Z., Kawasaki S., Zheng G. -q., Chen G. F., Wang N. L.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   634 - 634   2012.3

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  • 22pGH-2 As-NQR study of LaFeAsO_<1-x>F_x II

    Oka T., Li Z., Kawasaki S., Zheng G. -q., Chen G. F., Luo J. L., Wang N. L.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   659 - 659   2010.3

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  • 22pGH-6 NQR study of LaNiAsO_<1-x>F_x IV

    Tabuchi T., Li Z., Kawasaki S., Zheng G. -q., Chen G. F., Luo J. L., Wang N. L.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   660 - 660   2010.3

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  • 20pGA-13 Evolution of Pseudogap Ground State in Single-Layered Copper-Oxide Bi_2Sr_<2-x>La_xCuO_<6+δ> Revealed by ^<63,65>Cu-Nuclear Magnetic Resonance

    Kawasaki S., Lin C. T., Kuhns P. L., Reyes A. P., Zheng G. -q.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   551 - 551   2010.3

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  • 28pTA-9 As-NQR study of LaFeAsO_<1-x>F_x

    Kawasaki S., Matano K., Shimada K., Oka T., Ooe Y., Zheng G.-q., Chen G. F., Luo J. L., Wan N. L.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   613 - 613   2009.3

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  • 27aPS-25 Superconductivity of CeRhIn_5 in Magnetic Field: studied by In-NMR

    Yashima M., Kawasaki S., Mukuda H., Kitaoka Y., Shishido H., Settai R., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   536 - 536   2009.3

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  • 28aPS-4 NQR study of LaNiAsO_<1-x>F_x II

    Tabuchi T., Li Z., Kawasaki S., Zheng G.-q., Chen G. F., Luo J. L., Wang N. L.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   596 - 596   2009.3

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  • 28pTA-8 As-NMR study in iron arsenide superconductor

    Matano K., Tahara K., Kawasaki S., Zheng G.-q., Ren Z. A., Dong X. L., Sun L., Zhao Z. X., Chen G. F., Luo J. L., Wang N. L.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   613 - 613   2009.3

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  • 26aRH-1 NMR study of pseudogap state in single crystalline Bi_2Sr_<2-x>La_xCuO_6

    Kawasaki S., Shimada K., Zheng G.-p., Kuhns P.L., Reyes A.P., Liang B., Lin C.T.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   629 - 629   2008.2

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  • 24pYB-9 ^<59>Co-NMR/NQR study in Li_xCoO_2(x=0,0.12,0.35)

    Shimada K., Kawasaki S., Zheng G.-q., Motohashi T., Ono T., Kanno R., Karppinen M., Yamauchi H.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   613 - 613   2008.2

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  • Sb-NQR study of PrOs4Sb12 under high pressure

    S. Kawasaki, K. Katayama, M. Nishiyama, H. Kotegawa, T. C. Kobayashi, H. Sugawara, D. Kikuchi, H. Sato, G.-q. Zheng

    J. Phys. Soc. Jpn.   77 ( Suppl. A )   330 - 332   2008

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  • 21pPSB-4 Sb-NQR study of PrOs_4Sb_<12> under pressure III

    Katayama K., Kawasaki S., Zheng G. -q., Kotegawa H., Kobayashi T. C., Sugawara H., Kikuchi D., Sato H.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   573 - 573   2007.8

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  • 21aPS-93 ^<59>Co NQR study of Na_xCoO_2・1.3H_2O under high pressure (III)

    Kusano E., Matano K., Kawasaki S., Zheng G-q., Cmaidalka J., Meng R.L., Chu C.W.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   538 - 538   2007.8

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  • 20pWP-12 ^<115>In-NQR study on CeRh_<1-x>Ir_xIn_5 under pressure III

    Mugino Y., Yashima M., Kawasaki S., Mukuda H., Kitaoka Y., Shishido H., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   634 - 634   2007.2

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  • 21aWG-4 ^<59>Co NQR study of Na_xCoO_2・1.3H_2O under high pressure (II)

    Kusano E., Kawasaki S., Nishiyama M., Zheng G-q., Cmaidalka J., Meng R.L., Chu C.W.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   640 - 640   2007.2

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  • 20pWP-6 Magnetism and Superconductivity in CeRhIn_5 part 2

    Yashima M., Kawasaki S., Mukuda H., Kitaoka Y., Shishido H., Settai R., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   633 - 633   2007.2

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  • 18pPSA-34 Sb-NQR study of PrOs_4Sb_<12> under pressure II

    Katayama K., Kawasaki S., Nishiyama M., Zheng G-q., Sugawara H., Kikuchi D., Sato H.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   520 - 520   2007.2

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  • 24aYA-4 Magnetism and Superconductivity near Magnetic Critical Point in CeRhIn_5

    Yashima M., Kawasaki S., Mukuda H., Kitaoka Y., Shishido H., Settai R., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   432 - 432   2006.8

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  • 25pZL-4 ^<59>Co NQR study of Na_xCoO_2^*1.3H_2O under high pressure

    Kusano E., Kawasaki S., Nishiyama M., Zheng G.-q., Cmaidalka J., Meng R.L., Chu C.W.

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   503 - 503   2006.8

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  • 25aYA-8 Sb-NQR study of PrOs_4Sb_<12> under pressure

    Katayama K., Kawasaki S., Nishiyama M., Zheng G-q., Harima H., Sugawara H., Kikuchi D., Sato H.

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   484 - 484   2006.8

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  • 29pRA-4 ^<29>Si-NMR Study of CePt_3Si II

    Iwasaki K., Yogi M., Harada A., Kawasaki S., Mukuda H., Kitaoka Y., Yasuda T., Settai R., Matsuda T.D., Haga Y., Onuki Y., Itoh K., Haller E.E.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   612 - 612   2006.3

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  • 29pRA-14 ^<73>Ge-NQR Study of pressure-induced superconductor CeNiGe_3

    Harada A., Kawasaki S., Mukuda H., Kitaoka Y., Arumugamu Thamizhavel, Okuda Y., Onuki Y., Itoh K., Haller E.E., Harima H.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   615 - 615   2006.3

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  • 29pRA-13 Pressure effect of CeNiGe_3 and CeNi_2Ge_2

    Miyoshi T., Takeda K., Fukushima S., Hidaka H., Kotegawa H., Kobayashi T.C., Nakashima M., Thamizhavel A., Settai R., Onuki Y., Kawasaki S., Kitaoka Y., Fukuhara T., Maezawa K., Itoh K.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   614 - 614   2006.3

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  • 29pRA-5 ^<29>Si-NMR in pressure-induced superconductor CeRhSi_3 without inversion symmetry

    Fujii T., Yashima M., Kawasaki S., Mukuda H., Kitaoka Y., Okuda Y., Thamizhavel A., Settai R., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   612 - 612   2006.3

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  • 27aUF-7 Superconducting property of Ce_2RhIn_8 by NQR under high pressure

    Miyazaki H., Yashima M., Kawasaki S., Kitaoka Y., Shishido H., Settai R., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   518 - 518   2006.3

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  • 27aUF-3 ^<115>In-NQR study on CeRh_<1-x>Ir_xIn_5 under pressure 2

    Mugino Y., Yashima M., Kawasaki S., Mukuda H., Kitaoka Y., Shishido H., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   518 - 518   2006.3

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  • 27pTC-9 ^<73>Ge-NQR study of CeNi_2Ge_2 II

    Sada T., Kawasaki S., Mukuda H., Kitaoka Y., Miyoshi T., Kotegawa H., Kobayashi T.C., Fukuhara T., Maezawa K., Itoh K.M., Haller E.E.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   554 - 554   2006.3

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  • 27aUF-2 Tetracritical Point in CeRhIn_5 : A study of ^<115>In-NQR under Pressure

    Yashima M., Kawasaki S., Mukuda H., Kitaoka Y., Shishido H., Settai R., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   517 - 517   2006.3

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  • Magnetic criticality and unconventional superconductivity in CeCoIn5: Study of (115)in-nuclear quadrupole resonance under pressure

    M Yashima, S Kawasaki, Y Kawasaki, GQ Zheng, Y Kitaoka, H Shishido, R Settai, Y Haga, Y Onuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 8 )   2073 - 2076   2004.8

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    We report the systematic evolution of the superconducting (SC) characteristics of the heavy-fermion (HF) superconductor CeCoIn5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The application of P significantly suppresses the nuclear spin-lattice relaxation rate 1/T-1 that is dominated by antiferromagnetic (AFM) spin fluctuations (SFs) specific to a quantum critical point (QCP). It is demonstrated that the marked suppression of AFM SFs leads to a reduction in the SC energy gap or in the coupling strength of the Cooper pair. T-c,T- nevertheless, increases with increasing P due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long.

    DOI: 10.1143/JPSJ.73.2073

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  • Magnetism and superconductivity near the quantum criticality in CeRhIn5: In-115-NQR study under pressure

    S. Kawasaki, T. Mito, Y. Kawasaki, G. -q. Zheng, Y. Kitaoka, D. Aoki, Y. Haga, Y. Onuki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   E19 - E20   2004.5

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    We report a study on the interplay between antiferromagnetism (AFM) and superconductivity (SC) in CeRhIn5 under pressure P = 1.75 GPa: The onset of the magnetic order is evidenced from a clear split of In-115-NQR spectrum due to the spontaneous internal field below T-N = 2.5 K: Simultaneously, bulk SC is demonstrated by the observation of the Meissner diamagnetism signal whose size is the same as in the exclusively superconducting phase. These results indicate that the AFM coexists homogeneously with the SC at a microscopic level. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2003.11.122

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  • Unconventional superconductivity and antiferromagnetic spin fluctuations in the heavy fermion compound CeCoIn5: In-115-NQR study under pressure

    M. Yashima, S. Kawasaki, Y. Kawasaki, G. -q. Zheng, Y. Kitaoka, H. Shishido, R. Settai, Y. Onuki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   E679 - E681   2004.5

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    We report systematic evolution of superconducting (SC) characteristic of heavy-fermion superconductor CeCoIn5 via the nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The temperature dependence of nuclear spin - lattice relaxation rate (1/T-1) below T-C has revealed that once the value of SC energy gap (2 Delta(0)/k(B)T(C)) slightly increases in P&lt;0.45 GPa, with further increasing P, it decreases significantly. By contrast, T-C increases monotonously up to 2.6 K as P increases up to 1 GPa, exhibiting a saturation in P = 1.0-1.5 GPa. (C) 2003 Elsevier B. V. All rights reserved.

    DOI: 10.1016/j.jmmm.2003.11.335

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  • The microscopic coexistence of superconductivityand ferromagnetism in UGe2: Ge-73-NMR/NQR study

    H. Kotegawa, S. Kawasaki, A. Harada, Y. Kawasaki, K. Okamoto, G. -q. Zheng, Y. Kitaoka, E. Yamamoto, Y. Haga, Y. Onuki, K. M. Itoh, E. E. Haller

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   E27 - E28   2004.5

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    We report Ge-73-NMR/NQR measurements on the itinerant ferromagnetic (FM) superconductor UGe2 at P = 1.2 GPa. The temperature (T) dependence of the nuclear spin lattice relaxation rate (1/T-1) at zero field has demonstrated the onset of the superconducting (SC) transition at T-c = 0.7 K. The lack of a coherence peak in 1/T-1 just below T-c, followed by a T-3-like behavior, provide compelling evidence for the unconventional nature of the SC state that coexists with the FM state on a microscopic scale in UGe2. (C) 2003 Elsevier B. V. All rights reserved.

    DOI: 10.1016/j.jmmm.2003.12.410

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  • 115In-NQR evidence for the bulk & unconventional superconductivity in CeIn3

    Kawasaki S., Mito T., Kawasaki Y., Zheng G.-q., Kitaoka Y., Shishido H., Araki S., Settai R., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   544 - 544   2002.8

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  • 24pWA-6 NMR Study of CeCoIn5

    Kawasaki Y., Ishida K., Zheng G. -q., Kawasaki S., Mito T., Kitaoka Y., Shishido H., Settai R., Haga Y., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   494 - 494   2002.3

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  • 24pWA-4 Coexistence of antiferromagnetism and superconductivity in CeRhIn_5

    Kawasaki S., Mito T., Kawasaki Y., Zheng G. -q., Kitaoka Y., Aoki D., Haga Y., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   493 - 493   2002.3

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Presentations

  • Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh$_{0.5}$Ir$_{0.5}$In$_5$

    S. Kawasaki, T. Oka, A. Sorime, Y. Kogame, K. Uemoto, K. Matano, J. Guo, S. Cai, L. L. Sun, J. L. Sarrao, J. D. Thompson, Guo-qing Zheng

    International conference on strongly correlated electron systems 2020 (SCES2020)  2021.9.27 

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    Event date: 2021.9.27 - 2021.10.2

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  • 重い電子系反強磁性超伝導体CeRh$_{0.5}$Ir$_{0.5}$In$_5$における局在・遍歴転移とギャップレス超伝導

    川崎慎司, 岡利英, 反り目章, 小亀雄司, 上本和宏, 俣野和明, J. Guo, S. Cai, Liling Sun, J. L. Sarrao, J, D. Thompson, 鄭国慶

    日本物理学会第76回年次大会  2021.3.14 

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  • Charge-density-wave order in single-layered Bi$_2$Sr$_{2-x}$La$_x$CuO$_6$ superconductor Invited International conference

    KAWASAKI Shinji

    Spectroscopies in Novel Superconductors (SNS2019)  2019.6.21 

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  • Charge-Density-Wave Order and Pseudogap in Single Layered Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ Superconductor International conference

    Shinji Kawasaki

    12th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (M2S-2018)  2018.8.23 

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  • Bi2201における磁場誘起電荷密度波と擬ギャップ Invited

    川崎慎司

    日本物理学会第73回年次大会(領域8シンポジウム(一般)「超伝導体における新奇な対称性の破れ」)  2018.3.24 

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  • Doping dependence of the charge density wave order in single layered Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ superconductors revealed by high field NMR Invited International conference

    川崎慎司

    International Symposium on Frontier of Superconductivity Research (VI)-NMR and muSR on Unconventional Superconductors-  2016.10 

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  • Doping-enhanced antiferromagnetism in Ca$_{1-x}$La$_x$FeAs$_2$ revealed by $^{75}$As nuclear magnetic resonance and nuclear quadrupole resonance Invited

    Shinji Kawaskai

    第25回日本MRS年次大会国際シンポジウム「強相関機能材料の進展と挑戦」  2015.12.10 

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  • 銅酸化物高温超伝導体における磁場誘起電荷秩序と擬ギャップ状態 Invited

    KAWASAKI Shinji

    2015.11.11 

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  • 銅酸化物高温超伝導体Bi2201における磁場誘起CDW Invited

    川崎 慎司

    金属材料研究所強磁場超伝導材料研究センター研究会 「20テスラ超強磁場NMRによる物性研究2」  2015.11.10 

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  • 砒化物超伝導体SrPt$_2$As$_2$におけるCDWと超伝導のNMR/NQR法による研究

    川崎 慎司

    日本物理学会2015年秋季大会  2015.9.16 

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  • 銅酸化物高温超伝導体Bi2201の擬ギャップと超伝導 Invited

    KAWASAKI Shinji

    2013.11.18 

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  • 核磁気共鳴(NMR)法を用いた最近の超伝導研究について-高温超伝導研究の現状- Invited

    川崎 慎司

    2013年度 応用物理・物理系学会中国四国支部合同学術講演会 (日本物理学会 四国支部 第1回 チュートリアル講演会)  2013.7.28 

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  • NMR/NQR study of high-$T_c$ cuprate and iron pnictide Invited

    KAWASAKI Shinji

    International Symposium on Physics and Chemistry of Novel Superconductors and Related Materials  2012.10.1 

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  • 量子臨界点由来の新奇超伝導相の核磁気共鳴法による研究 Invited

    KAWASAKI Shinji

    2012.3.25 

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  • 擬ギャップの基底状態とそのドーピング依存性:超強磁場下NMR Invited

    川崎 慎司

    日本物理学会2011年秋季大会(領域8シンポジウム「高温超伝導体研究の最近の進展:波数空間と実空間プローブで探る擬ギャップと超伝導ギャップの関係」)  2011.9.23 

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  • CaFe$_2$As$_2$の圧力下As-NMR/NQRによる研究

    KAWASAKI Shinji

    2010.9.24 

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  • Bi$_2$Sr$_{2-x}$La$_x$CuO$_6$における擬ギャップの基底状態の研究 (強磁場NMR)3

    KAWASAKI Shinji

    2010.3.20 

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  • 鉄ヒ素系超伝導体のAs-NQRによる研究

    川崎慎司

    日本物理学会2009年年次大会  2009.3.28 

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  • ReFeAsOF (Re=La,Pr)の2ギャップ超伝導 Invited

    川崎慎司

    鉄ニクタイド物質系における超伝導ペア対称性と超伝導状態  2009.1.24 

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  • PrOs$_4$Sb$_{12}$における多重極揺らぎと超伝導

    川崎慎司

    新学術領域研究「重い電子系の形成と秩序化」第一回研究会  2009 

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  • PrOs$_4$Sb$_{12}$における多重極揺らぎと重い電子超伝導の核磁気共鳴法による研究

    川崎慎司

    新学術領域研究「重い電子系の形成と秩序化」第二回研究会  2009 

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  • Bi$_2$Sr$_{2-x}$La$_x$CuO$_6$における擬ギャップの基底状態の研究(強磁場NMR)

    川崎慎司

    日本物理学会2008年年次大会  2008 

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  • NQR圧力下の進展と置換系へのコメント

    科研費特定領域研究 「充填スクッテルダイト構造に創出する新しい量子多電子状態の展開」第6回まとめ研究会  2008 

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  • PrOs$_4$Sb$_{12}$の高圧下Sb-NQRによる研究

    川崎慎司

    科研費特定領域研究 「充填スクッテルダイト構造に創出する新しい量子多電子状態の展開」第6回まとめ研究会  2008 

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  • Bi$_2$Sr$_{2-x}$La$_x$CuO$_6$における擬ギャップの基底状態の研究(強磁場NMR)2

    川崎慎司

    日本物理学会2008年秋季大会  2008 

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  • REFeAsOF(RE:La, Pr)のNMR/NQRによる研究

    川崎慎司

    特定領域 "100テスラ領域の強磁場スピン科学"第5回シンポジウム  2008 

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  • 重い電子系超伝導体PrOs$_4$Sb$_{12}$の圧力下Sb-NQR による研究 Invited

    川崎慎司

    日本物理学会 中国支部・四国支部 2007 年度 支部学術講演会  2007.8.4 

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  • Sb-NQR study of PrOs$_4$Sb$_{12}$ under high pressure International conference

    川崎慎司

    International Conference on "New Quantum Phenomena in Skutterudite and Related Systems"  2007 

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  • PrOs$_4$Sb$_{12}$の圧力下Sb-NQRによる研究

    川崎慎司

    科研費特定領域研究 「充填スクッテルダイト構造に創出する新しい量子多電子状態の展開」第4回研究会  2006 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • $^{73}$Ge-NQR study of heavy-fermion compound CeNi$_2$Ge$_2$ under pressure International conference

    川崎慎司

    International Conference on Magnetism (ICM2006)  2006 

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  • Superconductivity in CeIrIn$_5$ under chemical and hydrostatic pressures: $^{115}$In-NQR study Invited International conference

    川崎慎司

    Joint Workshop on NQP-skutterudites and NPM in multi-approach  2005.11 

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  • CeIn$_3$の圧力下$^{115}$In-NQRによる研究3

    川崎慎司

    日本物理学会2005年秋季大会  2005.9.20 

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  • Superconductivity in CeIrIn$_5$ under chemical and hydrostatic pressures International conference

    Shinji Kawasaki

    The International conference on strongly correlated electrons systems (SCES'05)  2005.7 

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  • CeRh$_{1-x}$Ir$_x$In$_5$ (x = 0.7, 0.8) の115In-NQRによる研究

    川崎慎司

    日本物理学会2005年年次大会  2005.3.24 

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  • Novel Superconductivity and Magnetism in CeIn$_3$ and Ce115 Systems: a Study of $^{115}$In-NQR Under Pressure Invited

    KAWASAKI Shinji

    2004.9.12 

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Awards

  • 理学部教育貢献賞

    2014.3   岡山大学理学部  

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  • 若手トップリサーチャー研究奨励賞

    2011.3   Okayama University  

    KAWASAKI Shinji

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Research Projects

  • 単層型銅酸化物高温超伝導体における電荷密度波・擬ギャップ・超伝導の起源解明

    2018.10 - 2019.09

    住友電工グループ社会貢献基金  住友電工グループ社会貢献基金学術・研究助成 

    川崎 慎司

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    Authorship:Principal investigator  Grant type:Competitive

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Class subject in charge

  • Seminar in Low Temperature Condensed Matter Physics (2021academic year) Year-round  - その他

  • Basic Physics 1a (2021academic year) 1st semester  - 火1,火2

  • Basic Physics 1b (2021academic year) Second semester  - 火1,火2

  • Basic Physics I (2021academic year) 1st and 2nd semester  - 火1,火2

  • Physical Properties of Solids in High Magnetic Fields (2021academic year) Late  - その他

  • Information Physics Experiments 1 (2021academic year) 1st and 2nd semester  - 火5,火6,火7,火8

  • Information Physics Experiments 1 (2021academic year) 1st and 2nd semester  - 火5,火6,火7,火8

  • Physics Experiments 1 (2021academic year) 1st and 2nd semester  - 火5,火6,火7,火8

  • Superconductivity (2021academic year) Late  - 水5,水6

  • Seminar in Low Temperature Condensed Matter Physics (2020academic year) Year-round  - その他

  • Basic Physics 1a (2020academic year) 1st semester  - 火1,火2

  • Basic Physics 1b (2020academic year) Second semester  - 火1,火2

  • Basic Physics I (2020academic year) 1st and 2nd semester  - 火1,火2

  • Physical Properties of Solids in High Magnetic Fields (2020academic year) Late  - その他

  • Information Physics Experiments 1 (2020academic year) 1st and 2nd semester  - 火5,火6,火7,火8

  • Information Physics Experiments 1 (2020academic year) 1st and 2nd semester  - 火5,火6,火7,火8

  • Physics Experiments 1 (2020academic year) 1st and 2nd semester  - 火5,火6,火7,火8

  • Superconductivity (2020academic year) Late  - 水4,水5

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Media Coverage

  • 不純物散乱に強い未知の超伝導 岡山大が発見 Newspaper, magazine

    科学新聞  2020.9.18

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  • 岡山大、電気抵抗の原因となる不純物散乱に強い新たな超伝導を発見 Internet

    マイナビニュース  2020.9.3

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  • 高温超伝導転移直前に未知の電荷秩序 岡山大グループが発見 Newspaper, magazine

    科学新聞  1面  2017.11.24

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  • 超電導 直前電子特異な動き 岡山大大学院グループ発見 原理解明に期待 Newspaper, magazine

    山陽新聞  2017.11.3

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  • 超伝導研究の鍵発見 TV or radio program

    西日本放送(RNC)  RNC news every.  2017.11.2

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  • 磁性で超電導に 鉄酸化物 より高温の材料に道 岡山大 Newspaper, magazine

    日経産業新聞  2012.1.17

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  • 鉄系超電導の条件解明 高温転移 磁性が鍵 Newspaper, magazine

    山陽新聞  社会面  2012.1.17

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  • 「超電導」電子の基本構造を解明 TV or radio program

    NHK岡山放送局  おはようおかやま  2010.11.8

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  • 高温超電導の発現背景 異常金属相と完全に共存 岡山大の研究グループ 世界初 実験で解明 Newspaper, magazine

    科学新聞  1面  2010.10.8

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  • 超電導 特殊電子状態で発生 岡山大解明 常温物質探求に道 Newspaper, magazine

    日経産業新聞  2010.10.4

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  • 銅酸化物の超電導時 電子構造を特定 発生原理の解明寄与 岡山大大学院教授ら Newspaper, magazine

    山陽新聞  社会面  2010.10.1

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  • 岡山大学 高温超伝導の電子状態を解明 TV or radio program

    山陽放送(RSK)  Evening News  2010.9.30

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