Multiferroic properties of an akermanite Sr2CoSi2O7 single crystal in high magnetic fields

被引：30

作者：

Akaki, M. ^{[1
]}

Iwamoto, H. ^{[1
]}

Kihara, T. ^{[2
]}

Tokunaga, M. ^{[2
]}

Kuwahara, H. ^{[1
]}

机构：

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

[2] Univ Tokyo, ISSP, Chiba 2778581, Japan

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 06期

基金：

日本学术振兴会;

关键词：

D O I：

10.1103/PhysRevB.86.060413

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic and dielectric properties of akermanite Sr2CoSi2O7 single crystals in high magnetic fields were investigated. We have observed finite induced electric polarization along the c axis in high fields, wherein all Co spins were forcibly aligned to the magnetic field direction. Existence of the induced polarization in the spin-polarized state accompanied with the finite slope in the magnetization curve suggests the possible role of the orbital angular momenta in the excited states as its microscopic origin. The emergence of the field-induced polarization without particular magnetic order can be regarded as the magnetoelectric effects of the second order from the symmetry point of view. A low magnetic field-driven electric polarization flip induced by a rotating field, even at room temperature, has been successfully demonstrated.

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页数：4

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