Anisotropic Exchange within Decoupled Tetrahedra in the Quantum Breathing Pyrochlore Ba3Yb2Zn5O11

被引：63

作者：

Rau, J. G. ^{[1
]}

Wu, L. S. ^{[2
]}

May, A. F. ^{[3
]}

Poudel, L. ^{[2
,4
]}

Winn, B. ^{[2
]}

Garlea, V. O. ^{[2
]}

Huq, A. ^{[5
]}

Whitfield, P. ^{[5
]}

Taylor, A. E. ^{[2
]}

Lumsden, M. D. ^{[2
]}

Gingras, M. J. P. ^{[1
,6
,7
]}

Christianson, A. D. ^{[2
,4
]}

机构：

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

[2] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

[3] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[4] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37966 USA

[5] Oak Ridge Natl Lab, Chem & Engn Mat Div, Oak Ridge, TN 37831 USA

[6] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada

[7] Canadian Inst Adv Res, 180 Dundas St West,Suite 1400, Toronto, ON M5G IZ8, Canada

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 25期

基金：

加拿大自然科学与工程研究理事会;

关键词：

CRYSTAL-STRUCTURE; ANTIFERROMAGNET; TRANSITION; SYSTEMS; LIQUIDS;

D O I：

10.1103/PhysRevLett.116.257204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The low energy spin excitation spectrum of the breathing pyrochlore Ba3Yb2Zn5O11 has been investigated with inelastic neutron scattering. Several nearly resolution limited modes with no observable dispersion are observed at 250 mK while, at elevated temperatures, transitions between excited levels become visible. To gain deeper insight, a theoretical model of isolated Yb3+ tetrahedra parametrized by four anisotropic exchange constants is constructed. The model reproduces the inelastic neutron scattering data, specific heat, and magnetic susceptibility with high fidelity. The fitted exchange parameters reveal a Heisenberg antiferromagnet with a very large Dzyaloshinskii-Moriya interaction. Using this model, we predict the appearance of an unusual octupolar paramagnet at low temperatures and speculate on the development of intertetrahedron correlations.

引用

页数：6

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