J. Phys. IV France
Volume 114, April 2004
Page(s) 387 - 389

J. Phys. IV France
114 (2004) 387
DOI: 10.1051/jp4:2004114092

Characterization of transport and magnetic properties of a Mott insulator, ${\beta^{\prime}}$-(BEDT-TTF) 2IBrCl

K. Uchiyama1, M. Miyashita1, H. Taniguchi1, 1, K. Satoh1, N. Môri1, K. Miyagawa2, K. Kanoda2, M. Hedo3 and Y. Uwatoko3

1  Department of physics, Faculty of Science, Saitama University, Shimo-Ohkubo 255, Sakura-ku, Saitama 338-8570, Japan
2  Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
3  Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan

Physical properties of an organic conductor, $\beta
\prime $ -(BEDT-TTF) 2IBrCl, were characterized under ambient and extremely high pressures. Semiconducting behavior with activation energy, Ea=0.11eV, and antiferromagnetic transition with TN=19.5K were uncovered in the present work. In addition, we have found that this salt showed a sign of superconductivity at 8.0GPa in common with the case of the $\beta
\prime $-(BEDT-TTF) 2ICl 2, which is the highest- Tc superconductor among organics. Key words. Organic superconductor, magnetic susceptibility, antiferromagntic transition, high pressure.

© EDP Sciences 2004