Anisotropic exchange in frustrated pyrochlore Yb2Ti2O7

被引：39

作者：

Cao, H. B. ^{[2
]}

Gukasov, A. ^{[2
]}

Mirebeau, I. ^{[2
]}

Bonville, P. ^{[1
]}

机构：

[1] CEA, Ctr Saclay, IRAMIS, Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France

[2] CEA, Ctr Saclay, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2009年 / 21卷 / 49期

关键词：

CRYSTAL-FIELD;

D O I：

10.1088/0953-8984/21/49/492202

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The local Yb3+ magnetic susceptibility tensor was recently measured in the frustrated pyrochlore compound Yb2Ti2O7 by means of in-field polarized neutron scattering in a single crystal. A very anisotropic effective exchange tensor was derived for the Yb3+ ion. Using this result, we reinterpret here the data for the powder susceptibility in Yb2Ti2O7. We show that, in the case of a well-isolated Kramers doublet with anisotropic g and exchange tensors, the inverse susceptibility for a powder sample does not strictly obey a Curie-Weiss law at low temperature. We discuss the consequences regarding the paramagnetic Curie temperature, usually taken as a measure of the exchange/dipolar interaction, and the exotic 'slow fluctuation' ground state of Yb2Ti2O7.

引用

页数：5

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