期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 74, 期 7, 页码 2011-2016出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.74.2011
关键词
metal-insulator transition; BEDT-TTF; organic conductor; charge ordering; crystal structure
The crystal structure of theta-(BEDT-TTF)(2)RbCo(SCN)(4) in its insulating state below T-MI (approximately 200 K) was investigated by X-ray diffraction experiments. The transfer integrals between the BEDT-TTF molecules were also calculated from the structural data, and the ionicities of BEDT-TTF molecules were estimated from the intramolecular bond length distribution. A large modulation of transfer integrals and charge disproportionation between BEDT-TTF molecules were found. The ratio of ionicities was 0 to +0.2 : +0.8 to +1.0. These results were compared with thoes of the analogous salt theta-(BEDT-TTF)(2)RbZn(SCN)(4).
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