Uniaxial chemical pressure and disorder effects on magnetic and dielectric properties of β′-(BEDT-TTF)2(ICl2)1-x(AuCl2)x

Naoki Yoneyama; Takahide Kurobe; Satoshi Iguchi; Akira Miura; Takahiro Takei; Nobuhiro Kumada; Takahiko Sasaki

doi:10.7566/JPSJ.84.033709

Uniaxial chemical pressure and disorder effects on magnetic and dielectric properties of β′-(BEDT-TTF)₂(ICl₂)_1-x(AuCl₂)_x

Naoki Yoneyama, Takahide Kurobe, Satoshi Iguchi, Akira Miura, Takahiro Takei, Nobuhiro Kumada, Takahiko Sasaki

IMR - Materials Property Division

Research output: Contribution to journal › Article › peer-review

Abstract

We have studied the structural, magnetic, and dielectric properties of the dimer-Mott insulator β′-(BEDT-TTF)₂(ICl₂)_1-x(AuCl₂)_x. The AuCl₂ substitution for ICl₂ decreases the lattice length in the interlayer direction, leading to uniaxial chemical pressure with a negligible effect on the intralayer donor stacking. The variation of the Néel temperature as a function of x is explained on the basis of chemical pressure accompanied by anion disorder, while the dielectric response does not indicate the effect of chemical pressure. This suggests that the charge degrees of freedom are attributed to the intralayer origin such as the charge fluctuation of donor molecules induced by an electric field.

Original language	English
Article number	033709
Journal	Journal of the Physical Society of Japan
Volume	84
Issue number	3
DOIs	https://doi.org/10.7566/JPSJ.84.033709
Publication status	Published - 2015 Mar 15

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title = "Uniaxial chemical pressure and disorder effects on magnetic and dielectric properties of β′-(BEDT-TTF)2(ICl2)1-x(AuCl2)x",

abstract = "We have studied the structural, magnetic, and dielectric properties of the dimer-Mott insulator β′-(BEDT-TTF)2(ICl2)1-x(AuCl2)x. The AuCl2 substitution for ICl2 decreases the lattice length in the interlayer direction, leading to uniaxial chemical pressure with a negligible effect on the intralayer donor stacking. The variation of the N{\'e}el temperature as a function of x is explained on the basis of chemical pressure accompanied by anion disorder, while the dielectric response does not indicate the effect of chemical pressure. This suggests that the charge degrees of freedom are attributed to the intralayer origin such as the charge fluctuation of donor molecules induced by an electric field.",

author = "Naoki Yoneyama and Takahide Kurobe and Satoshi Iguchi and Akira Miura and Takahiro Takei and Nobuhiro Kumada and Takahiko Sasaki",

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AU - Yoneyama, Naoki

AU - Kurobe, Takahide

AU - Iguchi, Satoshi

AU - Miura, Akira

AU - Takei, Takahiro

AU - Kumada, Nobuhiro

AU - Sasaki, Takahiko

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AB - We have studied the structural, magnetic, and dielectric properties of the dimer-Mott insulator β′-(BEDT-TTF)2(ICl2)1-x(AuCl2)x. The AuCl2 substitution for ICl2 decreases the lattice length in the interlayer direction, leading to uniaxial chemical pressure with a negligible effect on the intralayer donor stacking. The variation of the Néel temperature as a function of x is explained on the basis of chemical pressure accompanied by anion disorder, while the dielectric response does not indicate the effect of chemical pressure. This suggests that the charge degrees of freedom are attributed to the intralayer origin such as the charge fluctuation of donor molecules induced by an electric field.

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Uniaxial chemical pressure and disorder effects on magnetic and dielectric properties of β′-(BEDT-TTF)₂(ICl₂)_1-x(AuCl₂)_x

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