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

Majed Abdel-Jawad, Ichiro Terasaki, Takahiko Sasaki, Naoki Yoneyama, Norio Kobayashi, Yoshiaki Uesu, Chisa Hotta

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Abstract

We have measured and analyzed the dielectric constant of the dimer Mott insulator κ- (BEDT-TTF)2Cu2(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.

Original languageEnglish
Article number125119
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number12
DOIs
Publication statusPublished - 2010 Sep 21

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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