Ising versus XY Anisotropy in Frustrated R2Ti2O7 Compounds as "Seen'' by Polarized Neutrons

被引：100

作者：

Cao, H. ^{[1
]}

Gukasov, A. ^{[1
]}

Mirebeau, I. ^{[1
]}

Bonville, P. ^{[2
]}

Decorse, C. ^{[3
]}

Dhalenne, G. ^{[3
]}

机构：

[1] CE Saclay, CEA, CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

[2] CE Saclay, CEA, CNRS, Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France

[3] Univ Paris 11, ICMMO, Lab Physicochim Etat Solide, F-91405 Orsay, France

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 05期

关键词：

PYROCHLORE ANTIFERROMAGNET TB2TI2O7; SITE SUSCEPTIBILITY TENSORS; CRYSTAL-FIELD; SPIN ICE; DIFFRACTION; YB2TI2O7; HO2TI2O7; STATE;

D O I：

10.1103/PhysRevLett.103.056402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We studied the field induced magnetic order in R2Ti2O7 pyrochlore compounds with either uniaxial (R = Ho, Tb) or planar (R = Er, Yb) anisotropy, by polarized neutron diffraction. The determination of the local susceptibility tensor {chi(parallel to), chi(perpendicular to)} provides a universal description of the field induced structures in the paramagnetic phase (2-270 K), whatever the field value (1-7 T) and direction. Comparison of the thermal variations of chi(parallel to) and chi(perpendicular to) with calculations using the rare earth crystal field shows that exchange and dipolar interactions must be taken into account. We determine the molecular field tensor in each case and show that it can be strongly anisotropic.

引用

页数：4

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