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J. Phys. Soc. Jpn. 81 (2012) 011004 (27 pages)  |Previous Article| |Next Article|  |Table of Contents|
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SPECIAL TOPICS

Recent Topics of Organic Superconductors

Arzhang Ardavan, Stuart Brown1, Seiichi Kagoshima2, Kazushi Kanoda3, Kazuhiko Kuroki4, Hatsumi Mori5, Masao Ogata6, Shinya Uji7,8, and Jochen Wosnitza9

Clarendon Laboratory, Department of Physics, University of Oxford, OX1 3PU, U.K.
1Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095-1547, U.S.A.
2Deaprtment of Physics, Meiji University, Tama-ku, Kawasaki 214-8571, Japan
3Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
4Department of Engineering Science, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
5Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
6Department of Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
7National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
8Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
9Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany

(Received October 24, 2011; Accepted November 28, 2011; Published December 26, 2011)

Recent developments in research into superconductivity in organic materials are reviewed. In the epoch-defining quasi-one-dimensional TMTSF superconductors with Tc ∼1 K, Tc decreases monotonically with increasing pressure, as do signatures of spin fluctuations in the normal state, providing good evidence for magnetically-mediated pairing. Upper critical fields exceed the Zeeman-limiting field by several times, suggesting triplet pairing or a transition to an inhomogeneous superconducting state at high magnetic fields, while triplet pairing is ruled out at low fields by NMR Knight-shift measurements. Evidence for a spatially inhomogeneous superconducting state, Fulde–Ferrel–Larkin–Ovchinnikov state, which has long been sought in various superconducting systems, is now captured by thermodynamic and transport measurements for clean and highly two-dimensional BEDT-TTF and BETS superconductors. Some of the layered superconductors also serve as model systems for Mott physics on anisotropic triangular lattice. For example, the Nernst effect and the pseudo-gap behavior in NMR relaxation are enhanced near to the Mott transition. In the case of increasing spin frustration, the superconducting transition temperature is depressed, and antiferromagnetic ordering is eliminated altogether in the adjacent Mott insulating phase. There is an increasing number of materials exhibiting superconductivity in competition or cooperation with charge order. Theoretical studies shed light on the role of spin and/or charge fluctuations for superconductivity appearing under conditions close to those of correlation-induced insulating phases in the diversity of organic materials. ©2012 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/81/011004/
DOI: 10.1143/JPSJ.81.011004


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