Anomalous dielectric response in the dimer Mott insulator κ-(BEDT-TTF)2Cu2(CN)3
Anomalous dielectric response in the dimer Mott insulator κ-(BEDT-TTF)2Cu2(CN)3
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DOI：
10.1103/physrevb.82.125119
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发表时间：
2010-09-21
影响因子：
3.7
通讯作者：
Hotta, Chisa
中科院分区：
文献类型：
--
作者：
Abdel-Jawad, Majed;Terasaki, Ichiro;Hotta, Chisa
我们测量并分析了二聚体Mott绝缘体kappa-（BEDT-TTF）（2）Cu-2（CN）（3）的介电常数，该绝缘体被称为自旋液态的游乐场。最出乎意料的是，这种特定的有机盐具有非平凡的电荷自由度，其特征在于低于约60 K的弛豫型介电弛豫。这归因于二聚体内的电荷分离，由于位间库仑排斥。一个可能的微观模型的建议和讨论。
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.