Electric Polarization Induced by Neel Order without Magnetic Superlattice: Experimental Study of Cu3Mo2O9 and Numerical Study of a Small Spin Cluster

被引：28

作者：

Kuroe, Haruhiko ^{[1
]}

Hosaka, Tomohiro ^{[1
]}

Hachiuma, Suguru ^{[1
]}

Sekine, Tomoyuki ^{[1
]}

Hase, Masashi ^{[2
]}

Oka, Kunihiko ^{[3
]}

Ito, Toshimitsu ^{[3
]}

Eisaki, Hiroshi ^{[3
]}

Fujisawa, Masashi ^{[4
]}

Okubo, Susumu ^{[4
]}

Ohta, Hitoshi ^{[4
]}

机构：

[1] Sophia Univ, Dept Phys, Chiyoda Ku, Tokyo 1028554, Japan

[2] NIMS, Tsukuba, Ibaraki 3050047, Japan

[3] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[4] Kobe Univ, Mol Photosci Res Ctr, Kobe, Hyogo 6578501, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2011年 / 80卷 / 08期

关键词：

multiferroic materials; frustrating magnet; charge redistribution; Mott insulator; distorted tetrahedral spin system;

D O I：

10.1143/JPSJ.80.083705

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We clarify that the antiferromagnetic order in the distorted tetrahedral quasi-one-dimensional spin system induces electric polarization. In this system, the effects of low dimensionality and magnetic frustration are expected to appear simultaneously. We obtain the magnetic-field-temperature phase diagram of Cu3Mo2O9 by studying the dielectric constant and spontaneous electric polarization. Around the tricritical point at 10 T and 8K, the change in the direction of electric polarization causes a colossal magnetocapacitance. We calculate the charge redistribution in a small spin cluster consisting of two magnetic tetrahedra to demonstrate the electric polarization induced by the antiferromagnetism.

引用

页数：4

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