J. Phys. IV France 114 (2004) 399
Charge disproportionation in the metallic state of -(BEDT-TTF) 2I 3S. Moroto1, 1, K.-I. Hiraki1, Y. Takano1, Y. Kubo1, T. Takahashi1, H.M. Yamamoto2 and T. Nakamura3
1 Department of Physics, Gakushuin University, Mejiro, Toshima-ku, Tokyo 171-8588, Japan
2 RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan
3 Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
13C-NMR measurements have been carried out on the quasi two-dimensional organic conductor, -(BEDT-TTF) 2I 3. We measured the angular dependence of 13C-NMR spectrum at several temperatures above metal-insulator transition temperature, 135 K (= . We found that charge (spin) disproportionation already exists in the metallic state and gradually develops as temperature approaches to . Key words. 13C-NMR, Charge disproportination.
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