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Title: Hierarchy of Exchange Interactions in the Triangular-Lattice Spin Liquid YbMgGaO 4

Abstract

The spin-1/2 triangular lattice antiferromagnet YbMgGaO 4 has attracted attention recently as a quantum spin-liquid candidate with the possible presence of off-diagonal anisotropic exchange interactions induced by spin-orbit coupling. Whether a quantum spin liquid is stabilized or not depends on the interplay of various exchange interactions with chemical disorder that is inherent to the layered structure of the compound. We combine time-domain terahertz spectroscopy and inelastic neutron scattering measurements in the field-polarized state of YbMgGaO 4 to obtain better insight of its exchange interactions. Terahertz spectroscopy in this fashion functions as a high-field electron spin resonance and probes the spin-wave excitations at the Brillouin zone center, ideally complementing neutron scattering. A global spin-wave fit to all our spectroscopic data at fields over 4 T, informed by the analysis of the terahertz spectroscopy linewidths, yields constraints on the disorder-averaged g factors and exchange interactions. Our results paint YbMgGaO 4 as an easy-plane XXZ antiferromagnet with the combined and necessary presence of subleading next-nearest neighbor and weak anisotropic off-diagonal nearest-neighbor interactions. Moreover, the obtained g factors are substantially different from previous reports. Furthermore, this work establishes the hierarchy of exchange interactions in YbMgGaO 4 from high-field data alone and thus strongly constrainsmore » possible mechanisms responsible for the observed spin-liquid phenomenology.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1458603
Alternate Identifier(s):
OSTI ID: 1462902
Grant/Contract Number:  
[FG02-08ER46544; AC05-00OR22725]
Resource Type:
Published Article
Journal Name:
Physical Review X
Additional Journal Information:
[Journal Name: Physical Review X Journal Volume: 8 Journal Issue: 3]; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Zhang, Xinshu, Mahmood, Fahad, Daum, Marcus, Dun, Zhiling, Paddison, Joseph A. M., Laurita, Nicholas J., Hong, Tao, Zhou, Haidong, Armitage, N. P., and Mourigal, Martin. Hierarchy of Exchange Interactions in the Triangular-Lattice Spin Liquid YbMgGaO 4. United States: N. p., 2018. Web. doi:10.1103/PhysRevX.8.031001.
Zhang, Xinshu, Mahmood, Fahad, Daum, Marcus, Dun, Zhiling, Paddison, Joseph A. M., Laurita, Nicholas J., Hong, Tao, Zhou, Haidong, Armitage, N. P., & Mourigal, Martin. Hierarchy of Exchange Interactions in the Triangular-Lattice Spin Liquid YbMgGaO 4. United States. doi:10.1103/PhysRevX.8.031001.
Zhang, Xinshu, Mahmood, Fahad, Daum, Marcus, Dun, Zhiling, Paddison, Joseph A. M., Laurita, Nicholas J., Hong, Tao, Zhou, Haidong, Armitage, N. P., and Mourigal, Martin. Mon . "Hierarchy of Exchange Interactions in the Triangular-Lattice Spin Liquid YbMgGaO 4". United States. doi:10.1103/PhysRevX.8.031001.
@article{osti_1458603,
title = {Hierarchy of Exchange Interactions in the Triangular-Lattice Spin Liquid YbMgGaO 4},
author = {Zhang, Xinshu and Mahmood, Fahad and Daum, Marcus and Dun, Zhiling and Paddison, Joseph A. M. and Laurita, Nicholas J. and Hong, Tao and Zhou, Haidong and Armitage, N. P. and Mourigal, Martin},
abstractNote = {The spin-1/2 triangular lattice antiferromagnet YbMgGaO4 has attracted attention recently as a quantum spin-liquid candidate with the possible presence of off-diagonal anisotropic exchange interactions induced by spin-orbit coupling. Whether a quantum spin liquid is stabilized or not depends on the interplay of various exchange interactions with chemical disorder that is inherent to the layered structure of the compound. We combine time-domain terahertz spectroscopy and inelastic neutron scattering measurements in the field-polarized state of YbMgGaO4 to obtain better insight of its exchange interactions. Terahertz spectroscopy in this fashion functions as a high-field electron spin resonance and probes the spin-wave excitations at the Brillouin zone center, ideally complementing neutron scattering. A global spin-wave fit to all our spectroscopic data at fields over 4 T, informed by the analysis of the terahertz spectroscopy linewidths, yields constraints on the disorder-averaged g factors and exchange interactions. Our results paint YbMgGaO4 as an easy-plane XXZ antiferromagnet with the combined and necessary presence of subleading next-nearest neighbor and weak anisotropic off-diagonal nearest-neighbor interactions. Moreover, the obtained g factors are substantially different from previous reports. Furthermore, this work establishes the hierarchy of exchange interactions in YbMgGaO4 from high-field data alone and thus strongly constrains possible mechanisms responsible for the observed spin-liquid phenomenology.},
doi = {10.1103/PhysRevX.8.031001},
journal = {Physical Review X},
number = [3],
volume = [8],
place = {United States},
year = {2018},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevX.8.031001

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Cited by: 11 works
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