Numéro |
J. Phys. IV France
Volume 114, April 2004
|
|
---|---|---|
Page(s) | 227 - 231 | |
DOI | https://doi.org/10.1051/jp4:2004114049 |
J. Phys. IV France 114 (2004) 227
DOI: 10.1051/jp4:2004114049
Spin-liquid behavior and superconductivity in
-(BEDT-TTF)
2X: The role of uniaxial strain
M. Maesato1, Y. Shimizu1, 2, T. Ishikawa1, G. Saito1, K. Miyagawa2, 3 and K. Kanoda2, 3
1 Division of Chemistry, Graduate School of Science, Kyoto University, Oiwaketyo, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
2 Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
3 CREST, Japan Science and Technology Corporation (JST), Kawaguchi, Saitama 332-0012, Japan
Abstract
We have examined the relationship between the anisotropy
of the triangular lattice and the electronic states of
-(BEDT-TTF)
2X. We have found the spin-liquid behavior in a Mott
insulator
-(BEDT-TTF)
2Cu
2(CN)
3 which has nearly
regular triangular lattice. The
1H-NMR study confirmed that this
compound shows no magnetic ordering down to 32mK, indicating the significant
role of the large spin frustration. The uniaxial compressive strain along
the
b- or
c-axes induced superconductivity in close proximity to the
spin-liquid phase. Further, its transition temperature
TC was increased
under the strains. The enhancement of
TC has been interpreted by the
effect of the reduction of spin frustration by the strains. The
TC of
-(BEDT-TTF)
2X and its response to the uniaxial strain have
been discussed in terms of the anisotropy of the triangular lattice and
electron correlation.
Key words. Spin-liquid, Superconductivity, Mott insurator, Uniaxial
strain.
© EDP Sciences 2004