Relaxor ferroelectricity induced by electron correlations in a molecular dimer Mott insulator

S. Iguchi; S. Sasaki; N. Yoneyama; H. Taniguchi; T. Nishizaki; T. Sasaki

doi:10.1103/PhysRevB.87.075107

Relaxor ferroelectricity induced by electron correlations in a molecular dimer Mott insulator

Strongly Correlated Electrons 2015-06-11 v2

Authors: S. Iguchi , S. Sasaki , N. Yoneyama , H. Taniguchi , T. Nishizaki , T. Sasaki

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Abstract

We have investigated the dielectric response in an antiferromagnetic dimer-Mott insulator beta'-(BEDT-TTF)2ICl2 with square lattice, compared to a spin liquid candidate kappa-(BEDT-TTF)2Cu2(CN)3. Temperature dependence of the dielectric constant shows a peak structure obeying Curie-Weiss law with strong frequency dependence. We found an anisotropic ferroelectricity by pyrocurrent measurements, which suggests the charge disproportionation in a dimer. The ferroelectric actual charge freezing temperature is related to the antiferromagnetic interaction, which is expected to the charge-spin coupled degrees of freedom in the system.

Keywords

relaxor ferroelectricity dimer-Mott insulator electron correlations dielectric response charge disproportionation spin-liquid pyrocurrent

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@article{arxiv.1208.0633,
  title  = {Relaxor ferroelectricity induced by electron correlations in a molecular dimer Mott insulator},
  author = {S. Iguchi and S. Sasaki and N. Yoneyama and H. Taniguchi and T. Nishizaki and T. Sasaki},
  journal= {arXiv preprint arXiv:1208.0633},
  year   = {2015}
}

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5 pages, 4 figures, to be published in Phys. Rev. B

Relaxor ferroelectricity induced by electron correlations in a molecular dimer Mott insulator

Abstract

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