Anomalous dielectric response in the dimer Mott insulator $\kappa$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$

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

doi:10.1103/PhysRevB.82.125119

Anomalous dielectric response in the dimer Mott insulator $\kappa$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$

Strongly Correlated Electrons 2015-05-18 v2

Authors: 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 $\kappa-$ (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 dipole-glass-like dielectric relaxation below around 60 K. This is ascribed to the charge disproportionation within the dimer due to the intersite Coulomb repulsion. In this respect, the dipole observed here is purely quantum mechanical, and thereby exhibits unexpected responses.

Keywords

dimer Mott insulator dielectric response spin liquid charge disproportionation dipole glass organic salt quantum dipole

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@article{arxiv.1003.3902,
  title  = {Anomalous dielectric response in the dimer Mott insulator $\kappa$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$},
  author = {Majed Abdel-Jawad and Ichiro Terasaki and Takahiko Sasaki and Naoki Yoneyama and Norio Kobayashi and Yoshiaki Uesu and Chisa Hotta},
  journal= {arXiv preprint arXiv:1003.3902},
  year   = {2015}
}

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5 pages, 5 figures

Anomalous dielectric response in the dimer Mott insulator $\kappa$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$

Abstract

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