J. Phys. IV France 114 (2004) 333
High-pressure study of a Mott insulator (BEDT-TTF) (TCNQ)M. Miyashita1, K. Uchiyama1, H. Taniguchi1, 1, K. Satoh1, Y. Uwatoko2, N. Tajima3, M. Tamura1 and R. Kato3
1 Department of Physics, Faculty of Science, Saitama University, Shimo-Ohkubo 255 Saitama, Saitama 338-8570, Japan
2 The Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5 Kashiwa, Chiba 277-8581, Japan
3 RIKEN (The Institute of Physical and Chemical Research), Hirosawa 2-1 Wako, Saitama 351-0198, Japan
The resistive state of the charge-transfer complex, (BEDT-TTF)(TCNQ), was studied by application of hydrostatic pressure and uniaxial strain. An obtained (hydrostatic) pressure-temperature phase diagram was different from a reported one : in our phase diagram, low-temperature metallic phase exists. The results obtained by application of uniaxial strains were discussed in terms of a role of the dimer of BEDT-TTF in the present salt. Key words. Organic conductor, high pressure, uniaxial strain, metal-insulator transition, phase diagram.
© EDP Sciences 2004