研究者詳細 - 近藤　隆祐

論文 - 近藤　隆祐

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Novel electronic states of organic conductors under uniaxial stress or uniaxial strain 査読

S. Kagoshima, M. Maesato, Y. Kaga, R. Kondo

Synthetic Metals 117 ( 1-3 ) 87 - 90 2001年

Donor-acceptor-type complexes of (BEDT-TTF)(TCNQ) analogues: Peculiar magnetic transition in (BEDO-TTF)(Cl2TCNQ) 査読

T. Hasegawa, R Kondo, S. Kagoshima, Y. Iwasa, T. Mochida, T. Akutagawa, T. Nakamura

Synthetic Metals 120 991 - 992 2001年

Control of electronic properties of (formula presented) (formula presented) by the uniaxial strain method 査読

M. Maesato, Y. Kaga, R. Kondo, S. Kagoshima

Physical Review B - Condensed Matter and Materials Physics 64 ( 15 ) 2001年

記述言語：英語掲載種別：研究論文（学術雑誌）

Systematic uniaxial strain studies of (formula presented) (formula presented) have been carried out. By controlling the in-plane lattice parameters a and c independently, we find that both compounds have essentially the same phase diagram in electronic properties, although, under the hydrostatic pressures, they show quite different phase diagrams. The K salt shows the superconductivity like (formula presented) salt under the c-axis uniaxial strain, and the latter undergoes a transition to the density-wave state like the former under the a-axis uniaxial strain. These changes in electronic structures are verified by measuring the angle-dependent magnetoresistance. The electronic properties of these compounds can be systematically understood as a function of (formula presented) the ratio of the in-plane lattice parameters. © 2001 The American Physical Society.

DOI： 10.1103/PhysRevB.64.155104

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Control of electronic properties of alpha-(BEDT-TTF)(2)MHg(SCN)(4) (M=K,NH4) by the uniaxial strain method 査読

Maesato M, Kaga Y, Kondo R, Kagoshima S

PHYSICAL REVIEW B 64 ( 15 ) 1551041 - 1551048 2001年

Artificial control of intermolecular distance of organic superconductors: α -type BEDT-TTF compounds 査読

S. Kagoshima, T. Shibata, H. Hirai, R. Kondo, M. Maesato

Current Applied Physics 1 ( 1 ) 72 - 76 2001年

Electronic and crystal structures of organic superconductors under the uniaxial strain 査読

S. Kagoshima, R. Kondo, M. Maesato

Current Applied Physics 1 ( 4-5 ) 307 - 311 2001年

Uniaxial strain study of organic conductors (TMTSF)₂PF₆ 査読

H. Hirai, R. Kondo, M. Maesato, T. Shibata, S. Kagoshima

Synthetic Metals 120 ( 1-3 ) 963 - 964 2001年

Uniaxial strain study of organic conductors α-(BEDT-TTF)₂MHg(SCN)₄ [M=K, NH₄] 査読

M. Maesato, Y. Kaga, R. Kondo, H. Hirai, S. Kagoshima

Synthetic Metals 120 ( 1-3 ) 941 - 942 2001年

Control of electronic properties of organic conductors by uniaxial strain method 査読

S. Kagoshima, M. Maesato, R. Kondo, T. Shibata, H. Hirai

Synthetic Metals 120 ( 1-3 ) 683 - 686 2001年

Control of electronic properties of organic conductors by hydrostatic and uniaxial compression 査読

S. Kagoshima, R. Kondo, H. Hirai, T. Shibata, Y. Kaga, M. Maesato

Physica Status Solidi (B) Basic Research 223 ( 1 ) 97 - 104 2001年

Electronic states in the spin-density wave phase of organic conductors: Roles of the coexisting 2k_F and 4k_F charge-density waves 査読

S. Kagoshima, Y. Saso, M. Maesato, R. Kondo, T. Yamaguchi, V.A. Bondarenko, T. Hasegawa

Synthetic Metals 117 ( 1-3 ) 39 - 43 2001年

Mixed-stack organic charge-transfer complexes with intercolumnar networks 査読

T Hasegawa, T Mochida, R Kondo, S Kagoshima, Y Iwasa, T Akutagawa, T Nakamura, G Saito

PHYSICAL REVIEW B 62 ( 15 ) 10059 - 10066 2000年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER PHYSICAL SOC

We report synthesis and examination of the electronic properties of an isomorphous series of mixed-stack organic charge-transfer complexes, composed of [bis(ethylenedithio) tetrathiafulvalene] (BEDT-TTF)-based electron donors and electron accepters of halogen-substituted tetracyanoquinodimethanes (TCNQ's). Single crystals of (BEDT-TTF)(Me,TCNQ), (BEDT-TTF)(CIMeTCNQ), and (BEDO-TTF)(Cl(2)TCNQ) were investigated as to their crystal structures, and optical and magnetic properties. The intermolecular overlaps between the stacked columns were comparable to the face-to-face overlap between the donor and the acceptor molecules inside the stacks. As seen from the optical and magnetic measurements, the (BEDT-TTF)(Me,TCNQ) and (BEDT-TTF)(ClMeTCNQ) complexes were neutral, while the (BEDO-TTF)(Cl(2)TCNQ), complex was found to be ionic. Among these complexes, anomalous magnetic properties were observed in the ionic complex of (BEDO-TTF)(Cl(2)TCNQ). (BEDO-TTF)(CI,TCNQ) is a magnetic insulator with Curie-Weiss behavior in magnetic susceptibility followed by a sharp drop at around 120 K, which is in sharp contrast to conventional "spin-Peierls-type'' nonmagnetic mixed-stack ionic compounds.

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Uniaxial strain method for soft crystals: Application to the control of the electronic properties of organic conductors

M Maesato, Y Kaga, R Kondo, S Kagoshima

REVIEW OF SCIENTIFIC INSTRUMENTS 71 ( 1 ) 176 - 181 2000年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER INST PHYSICS

We developed the uniaxial strain method to compress a crystalline sample along any direction without involving Poisson's effect. The uniaxial strain is realized by inserting a composite of either the sample embedded in epoxy or the sample in frozen oil into a cylinder much harder than the sample composite followed by the application of external forces to a piston put on the sample composite. We verified, by using a strain gauge embedded in the epoxy or the frozen oil, that the strain thus created has the uniaxial nature. Resistance measurements on two kinds of organic conductors, alpha-(BEDT-TTF)(2)KHg(SCN)(4) and alpha-(BEDT-TTF)(2)I-3 under the uniaxial strain showed novel electric properties that have never been found under hydrostatic pressures. Their properties were found to be largely dominated by the direction of the uniaxial strain even when it is applied along directions in the conducting plane having a two-dimensional nature. (C) 2000 American Institute of Physics. [S0034-6748(00)05001-2].

DOI： 10.1063/1.1150180

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Mixed-stack organic charge-transfer complexes with intercolumnar networks 査読

HASEGAWA T, MOCHIDA T, KONDO R, KAGOSHIMA S, IWASA Y, AKUTAGAWA T, NAKAMURA T, SAITO G

Physical Review B 62 ( 15 ) 10059 - 10066 2000年

Semiclassical and non-classical angular effects of magnetoresistance in (TMTSF)2X 査読

Toshihito Osada, Toshihito Osada, Nobuharu Kami, Nobuharu Kami, Ryusuke Kondo, Seiichi Kagoshima

Synthetic Metals 103 2024 - 2027 1999年6月

We have studied the semiclassical and non-semiclassical behaviors of magnetoresistance (MR) in a quasi-one-dimensional (Q1D) conductor (TMTSF)2ClO4. Based on the Boltzmann equation, we numerically investigated possible semiclassical 'angular effects', the characteristic patterns of the field-orientation-dependence of MR, in the general Q1D conductors. Particularly, we have clarified the complicated situation around B//1D-axis in which different angular effects are mixed up. The angular dependent MR features in the metallic phase of (TMTSF)2ClO4almost obey the semiclassical theory except a dip structure around B//b'. As for this non-semiclassical feature, we discuss the possibility of the one-body and many-body field-induced electron confinement onto a single conducting layer.

DOI： 10.1016/S0379-6779(98)00289-6

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Organic metals involving double chain donor arrangements, (BMDT-TTF)(2)((RR2)-R-1-TCNQ) [R-1 = H, Me, R-2 = Cl, Br] 査読

T Mochida, T Hasegawa, R Kondo, S Kagoshima, Y Iwasa

SYNTHETIC METALS 102 ( 1-3 ) 1680 - 1680 1999年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA

The title compounds show unique crystal structures involving double-column donor arrangements, affording characteristic fourfold Fermi surfaces. They show metallic conductivities, accompanied by metal-insulator transitions at low temperatures.

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Electronic phase transition of BEDT-TTF based mixed-stack charge-transfer complexes 査読

T Hasegawa, T Akutagawa, T Nakamura, Y Sasou, R Kondo, S Kagoshima, T Mochida, G Saito, Y Iwasa

SYNTHETIC METALS 103 ( 1-3 ) 1804 - 1805 1999年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA

The BEDT-TTF based mixed-stack charge-transfer (CT) complexes have been investigated for a series of isostructural compounds. The ionic complex of (BEDO-TTF)(Cl(2)TCNQ) is a magnetic insulator with showing Curie-Weiss behavior in magnetic susceptibility, in sharp contrast to the conventional mixed-stack CT complexes. The (BEDT-TTF)(ClMeTCNQ) compound undergoes neutral-ionic (NI) phase transition at high pressure.

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Structure and properties of (BEDSe-TTF)(Fn-TCNQ) charge transfer complexes (n=1, 2, 4) 査読

T Mochida, H Moriyama, T Hasegawa, R Kondo, S Kagoshima, Y Iwasa

SYNTHETIC METALS 102 ( 1-3 ) 1678 - 1679 1999年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA

Charge transfer complexes of bis(ethylenediselena)-tetrathiafulvalene.(BEDSe-TTF) with a variety of Fn-TCNQ (n = 1, 2, 4, including isomers) are synthesized. In this family, only F-1,-TCNQ afforded a conducting complex. Other accepters gave mixed stack insulators, which undergo antiferromagnetic phase transitions. 2,5-F-2- and 2,3-F-2-TCNQ also yielded a polymorph with a novel type of crystal structure, showing a double-chain donor arrangement.

DOI： 10.1016/S0379-6779(98)00578-5

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Structure and properties of ail organic conductor (BEDT-TseF)(2)(X(1)X(2)TCNQ) (X-1,X-2=Cl,Br) 査読

R Kondo, S Kagoshima, T Hasegawa, T Mochida, Y Iwasa

SYNTHETIC METALS 102 ( 1-3 ) 1628 - 1629 1999年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA

We synthesized donor-acceptor charge-transfer complexes composed of BEDT-TSeF ( or "BETS") and. TCNQ derivatives and obtained isosturctual complexes represented as (BETS)(2)(X(1)X(2)TCNQ) (X-1,X-2=Cl, Br). The single crystals of (BETS)(2)(Cl(2)TCNQ) preserve the metallic state down to 2K.

DOI： 10.1016/S0379-6779(98)00492-5

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Donor-acceptor type superconductor, (BETS)(2)(Cl(2)TCNQ) 査読

R Kondo, T Hasegawa, T Mochida, S Kagoshima, Y Iwasa

CHEMISTRY LETTERS 1999 ( 4 ) 333 - 334 1999年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：CHEMICAL SOC JAPAN

It was found that (BETS)(2)(Cl(2)TCNQ) is an all-organic superconductor, where BETS is bis(ethylenedithio)tetraselenafulvalene and Cl(2)TCNQ is 2,5-dichlorotetracyanoquinodimethane. The superconducting critical temperature was 1.3 K+/-0.3 K under pressure.

DOI： 10.1246/cl.1999.333

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