Nonuniform site-charge distribution and fluctuations of charge order in the metallic state of α-(BEDT-TTF)2I3

被引：58

作者：

Yue, Yue ^{[1
]}

Yamamoto, Kaoru ^{[1
]}

Uruichi, Mikio ^{[1
]}

Nakano, Chikako ^{[1
]}

Yakushi, Kyuya ^{[1
]}

Yamada, Shigeaki ^{[2
]}

Hiejima, Toshihiro ^{[2
]}

Kawamoto, Atsushi ^{[3
]}

机构：

[1] Grad Univ Adv Studies, Inst Mol Sci, Okazaki, Aichi 4448585, Japan

[2] Tokyo Polytech Univ, Dept Nanochem, Fac Engn, Atsugi, Kanagawa 2430297, Japan

[3] Hokkaido Univ, Dept Phys, Kita Ku, Sapporo, Hokkaido 0600810, Japan

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 07期

关键词：

ORGANIC CONDUCTOR ALPHA-(BEDT-TTF)(2)I-3; PHASE-TRANSITION; TRANSPORT-PROPERTIES; RAMAN; DISCOVERY; SPECTRA; MODES;

D O I：

10.1103/PhysRevB.82.075134

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present the site-charge distribution in the charge-ordered and metallic states of alpha-(BEDT-TTF)(2)I-3, based on the assignment of the C=C stretching modes nu(2), nu(3), and nu(27) of alpha-(BEDT-TTF)(2)I-3 with the aid of C-13- 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 alpha-(BEDT-TTF)(2)I-3 with those of isostructural alpha-(BEDT-TTF)(2)NH4Hg (SCN)(4), we propose a thermally activated fluctuation of charge order in the metallic phase of alpha-(BEDT-TTF)(2)I-3. This fluctuation was considerably suppressed above 0.65 GPa. The optical conductivity in the metallic phase shows no Drude response.

引用

页数：8

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