Macroscopic anisotropy and symmetry breaking in the pyrochlore antiferromagnet Gd2Ti2O7 -: art. no. 214432

被引：23

作者：

Hassan, AK

Lévy, LP

Darie, C

Strobel, P

机构：

[1] Max Planck Inst Festkorperforsch, Grenoble High Magnet Field Lab, F-38042 Grenoble 9, France

[2] CNRS, F-38042 Grenoble, France

[3] Inst Univ France, F-38402 St Martin Dheres, France

[4] Univ Grenoble 1, F-38402 St Martin Dheres, France

[5] CNRS, Cristallog Lab, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.67.214432

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the Heisenberg antiferromagnet Gd2Ti2O7, the exchange interactions are geometrically frustrated by the pyrochlore lattice structure. This ESR study reveals a strong temperature dependent anisotropy with respect to a [111] body diagonal below a temperature T-A=80 K, despite the spin only nature of the Gd3+ ion. Anisotropy and symmetry breaking can nevertheless appear through the superexchange interaction. In the presence of anisotropic exchanges, short range planar correlations restricted to specific Kagome planes are sufficient to explain the two ESR modes studied in this work.

引用

页数：5

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