Anomalous dielectric response in the dimer Mott insulator κ-(BEDT-TTF)2Cu2(CN)3

被引：160

作者：

Abdel-Jawad, Majed ^{[1
]}

Terasaki, Ichiro ^{[1
]}

Sasaki, Takahiko ^{[2
,3
]}

Yoneyama, Naoki ^{[2
,3
]}

Kobayashi, Norio ^{[4
]}

Uesu, Yoshiaki ^{[5
]}

Hotta, Chisa ^{[6
]}

机构：

[1] Waseda Univ, Dept Appl Phys, Tokyo 1698555, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[3] Japan Sci & Technol Agcy, CREST, Tokyo 1020075, Japan

[4] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[5] Waseda Univ, Dept Phys, Tokyo 1698555, Japan

[6] Kyoto Sangyo Univ, Dept Phys, Kyoto 6038555, Japan

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 12期

关键词：

GLASS-FORMING LIQUIDS; ORGANIC SUPERCONDUCTOR; RELAXORS; FERROELECTRICITY; RELAXATION; DYNAMICS; BEHAVIOR; LUFE2O4; STATE; SALT;

D O I：

10.1103/PhysRevB.82.125119

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have measured and analyzed the dielectric constant of the dimer Mott insulator kappa-(BEDT-TTF)(2)Cu-2(CN)(3), which is known as a playground for a spin-liquid state. Most unexpectedly, this particular organic salt has nontrivial charge degrees of freedom, being characterized by a relaxor-like dielectric relaxation below around 60 K. This is ascribed to the charge disproportionation within the dimer due to the intersite Coulomb repulsion. A possible microscopic model is suggested and discussed.

引用

页数：5

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[1] Anomaly in cluster glass behaviour of Co0.2Zn0.8Fe2O4 spinel oxide [J].