Energetic selection of ordered states in a model of the Er2Ti2O7 frustrated pyrochlore XY antiferromagnet

被引：68

作者：

McClarty, P. A. ^{[1
]}

Curnoe, S. H. ^{[2
]}

Gingras, M. J. P. ^{[1
,3
]}

机构：

[1] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[2] Mem Univ Newfoundland, Dept Phys & Phys Oceanog, St John, NF A1B 3X7, Canada

[3] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

来源：

HIGHLY FRUSTRATED MAGNETISM 2008 (HFM 2008) | 2009年 / 145卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

SPIN LIQUID;

D O I：

10.1088/1742-6596/145/1/012032

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We consider the possibility that the discrete long-range ordered states of Er2Ti2O7 are selected energetically at the mean field level as an alternative scenario that suggests selection via thermal fluctuations. We show that nearest neighbour exchange interactions alone are not sufficient for this purpose, but that anisotropies arising from excited single ion crystal field states in Er2Ti2O7, together with appropriate anisotropic exchange interactions, can produce the required long range order. However, the effect of the single ion anisotropies is rather weak so we expect thermal or quantum fluctuations, in some guise, to be ultimately important in this material. We reproduce recent experimental results for the variation of magnetic Bragg peak intensities as a function of magnetic field.

引用

页数：8

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