Nonuniform site-charge distribution and fluctuations of charge order in the metallic state of α-(BEDT-TTF)2I3
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概要
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We present the site-charge distribution in the charge-ordered and metallic states of α-(BEDT-TTF)2I3, based on the assignment of the C=C stretching modes ν2, ν3, and ν27 of α-(BEDT-TTF)2I3 with the aid of 13C- and deuterium-substituted compounds. The nonuniform site charges in both the metallic and insulating phases were consistent with those determined by a recent x-ray diffraction study. Comparing the line shapes of the charge-sensitive vibrational modes of α-(BEDT-TTF)2I3 with those of isostructural α-(BEDT-TTF)2NH4Hg(SCN)4, we propose a thermally activated fluctuation of charge order in the metallic phase of α-(BEDT-TTF)2I3. This fluctuation was considerably suppressed above 0.65 GPa. The optical conductivity in the metallic phase shows no Drude response.
- 2010-08-15
著者
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Yakushi K
Institute For Molecular Science
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Yakushi K
Inst. Molecular Sci. Okazaki
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Uruichi Mikio
Institute For Molecular Science
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Yakushi Kyuya
Graduate University For Advanced Studies
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