Spin waves and quantum criticality in the frustrated XY pyrochlore antiferromagnet Er2Ti2O7

被引：83

作者：

Ruff, J. P. C. ^{[1
]}

Clancy, J. P. ^{[1
]}

Bourque, A. ^{[2
]}

White, M. A. ^{[2
]}

Ramazanoglu, M. ^{[1
]}

Gardner, J. S. ^{[3
,4
]}

Qiu, Y. ^{[3
,5
]}

Copley, J. R. D. ^{[3
]}

Johnson, M. B. ^{[2
]}

Dabkowska, H. A. ^{[1
]}

Gaulin, B. D. ^{[1
,6
]}

机构：

[1] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

[2] Dalhousie Univ, Dept Chem, Inst Mat Res, Halifax, NS B3H 4J3, Canada

[3] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

[4] Indiana Univ, Bloomington, IN 47408 USA

[5] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

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

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 14期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.101.147205

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report detailed measurements of the low temperature magnetic phase diagram of Er2Ti2O7. Heat capacity and time- of- flight neutron scattering studies of single crystals reveal unconventional low- energy states. Er3+ magnetic ions reside on a pyrochlore lattice in Er2Ti2O7, where local XY anisotropy and antiferromagnetic interactions give rise to a unique frustrated system. In zero field, the ground state exhibits coexisting short and long- range order, accompanied by soft collective spin excitations previously believed to be absent. The application of finite magnetic fields tunes the ground state continuously through a landscape of noncollinear phases, divided by a zero temperature phase transition at mu(0)Hc similar to 1.5 T. The characteristic energy scale for spin fluctuations is seen to vanish at the critical point, as expected for a second order quantum phase transition driven by quantum fluctuations.

引用

页数：4

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