Spectroscopic studies of charge-ordering system in organic conductors |
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| Authors: | K Yakushi K Yamamoto R ?wietlik R Wojciechowski K Suzuki T Kawamoto T Mori Y Misaki K Tanaka |
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| Institution: | 1. Institute for Molecular Science, Nishigo-naka, Myodaiji, Okazaki, 444-8585, Japan;2. Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan;3. Department of Molecular Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan |
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| Abstract: | Charge localization generates a non-uniform charge distribution in some organic conductors. Phase transitions accompanying such a localization of charge are studied by using infrared and Raman spectroscopy. We first introduce θ-(BEDT-TTF)2MM′(SCN)4 (M=Rb, Cs, Tl; M′=Zn, Co) as typical examples of a charge-ordering system, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene. We apply the same spectroscopic technique to α′-(BEDT-TTF)2IBr2, θ-(BDT-TTF)2Cu(NCS)2, and (TTM-TTP)I3, which show the phase transitions from low-resistivity to high-resistivity state, where TTM-TTP is 2,5-bis4,5-bis(methylsulfonyl)-1,3-dithiol-2-ylidene]-1,3,4,6-tetrathiapentalene. |
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| Keywords: | charge transfer infrared spectroscopy Raman spectroscopy |
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