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Ferroelectric charge order enhanced by magnetic frustration in dimer Mott insulators

机译：二聚体莫特绝缘子中的磁阻效应增强了铁电电荷的阶数

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摘要

We investigate the effect of magnetic frustration on the dielectric properties of dimer Mott insulators. We adopt the two-dimensional quarter-filled extended Hubbard model for κ-(BEDT-TTF)_2X with an additional coupling with the dimer lattice motions, and numerically obtain the ground state. In the parameter range for strong magnetic frustration, an interdimer bond-length alternation mode that lifts the quasidegeneracy of classical spin configurations is strongly coupled to the electron system; this alternation mode occurs even with an extremely small electron-lattice coupling constant. Furthermore, the bond-length alternation induces in the dimers electric dipoles, which align along the same direction. A dimer Mott insulator phase with the ferroelectric charge order is obtained in the region. These results are consistent with the relaxorlike dielectric anomaly in κ-(BEDT - TTF)_2Cu_2(CN)_3.
机译：我们研究了磁阻对二聚体Mott绝缘子介电性能的影响。我们对κ-（BEDT-TTF）_2X采用二维四分填充的扩展Hubbard模型，并与二聚体晶格运动进行了附加耦合，并通过数值获得了基态。在强磁挫折的参数范围内，提升经典自旋构型的四边键合度的二聚体键长交替模式与电子系统紧密耦合。即使具有非常小的电子-晶格耦合常数，也会发生这种交替模式。此外，键长交替在二聚体中感应出沿相同方向排列的电偶极子。在该区域中获得具有铁电电荷顺序的二聚体莫特绝缘体相。这些结果与κ-（BEDT-TTF）_2Cu_2（CN）_3中的弛豫样介电异常一致。

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  • 来源
    《Physical review》 |2016年第3期|035105.1-035105.11|共11页
  • 作者

    Hiroki Gomi; Takeshi J. Inagaki; Akira Takahashi;

  • 作者单位

    Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-Cho, Showa-ku, Nagoya 466-8555, Japan, CREST, Japan Science and Technology Agency, Chiyoda-ku, Tokyo 102-0075, Japan;

    Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan;

    Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-Cho, Showa-ku, Nagoya 466-8555, Japan, CREST, Japan Science and Technology Agency, Chiyoda-ku, Tokyo 102-0075, Japan;

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