Ising Magnetism and Ferroelectricity in Ca3CoMnO6

被引：118

作者：

Wu, Hua ^{[1
]}

Burnus, T. ^{[1
]}

Hu, Z. ^{[1
]}

Martin, C. ^{[2
]}

Maignan, A. ^{[2
]}

Cezar, J. C. ^{[3
]}

Tanaka, A. ^{[4
]}

Brookes, N. B. ^{[3
]}

Khomskii, D. I. ^{[1
]}

Tjeng, L. H. ^{[1
]}

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[2] ENSICAEN, CNRS, UMR 6508, Lab CRISMAT, F-14050 Caen, France

[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[4] Hiroshima Univ, Dept Quantum Matter, ADSM, Higashihiroshima 7398530, Japan

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 02期

关键词：

ONE-DIMENSIONAL OXIDES; CA3CO1+XMN1-XO6; MULTIFERROICS;

D O I：

10.1103/PhysRevLett.102.026404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The origin of both the Ising chain magnetism and ferroelectricity in Ca3CoMnO6 is studied by ab initio electronic structure calculations and x-ray absorption spectroscopy. We find that Ca3CoMnO6 has alternate trigonal prismatic Co2+ and octahedral Mn4+ sites in the spin chain. Both the Co2+ and Mn4+ are in the high-spin state. In addition, the Co2+ has a huge orbital moment of 1.7 mu(B) which is responsible for the significant Ising magnetism. The centrosymmetric crystal structure known so far is calculated to be unstable with respect to exchange striction in the experimentally observed up arrow up arrow down arrow down arrow antiferromagnetic structure for the Ising chain. The calculated inequivalence of the Co-Mn distances accounts for the ferroelectricity.

引用

页数：4

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