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Evidence for a Field-Induced Quantum Spin Liquid in Alpha-RuCl3

Title
Evidence for a Field-Induced Quantum Spin Liquid in Alpha-RuCl3
Authors
Baek, S-H.Do, S-H.Choi, K-Y.Kwon, Y. S.Wolter, A. U. B.Nishimoto, S.van den Brink, JeroenBuechner, B.
DGIST Authors
Kwon, Y. S.
Issue Date
2017-07
Citation
Physical Review Letters, 119(3)
Type
Article
Article Type
Article
Keywords
AntiferromagnetExcitationsFerromagnetsField InducedField DirectionsGround StateHoneycomb LatticesHoneycomb StructuresKitaev ModelMagnetMagnetismNuclear Magnetic Resonance StudiesQuantum Spin LiquidQuantum TheoryResonance LineState
ISSN
0031-9007
Abstract
We report a 35Cl nuclear magnetic resonance study in the honeycomb lattice α-RuCl3, a material that has been suggested to potentially realize a Kitaev quantum spin liquid (QSL) ground state. Our results provide direct evidence that α-RuCl3 exhibits a magnetic-field-induced QSL. For fields larger than ∼10 T, a spin gap opens up while resonance lines remain sharp, evidencing that spins are quantum disordered and locally fluctuating. The spin gap increases linearly with an increasing magnetic field, reaching ∼50 K at 15 T, and is nearly isotropic with respect to the field direction. The unusual rapid increase of the spin gap with increasing field and its isotropic nature are incompatible with conventional magnetic ordering and, in particular, exclude that the ground state is a fully polarized ferromagnet. The presence of such a fieldinduced gapped QSL phase has indeed been predicted in the Kitaev model. © 2017 American Physical Society.
URI
http://hdl.handle.net/20.500.11750/5000
DOI
10.1103/PhysRevLett.119.037201
Publisher
American Physical Society
Related Researcher
  • Author Kwon, Yong Seung Quantum Functional Materials Laboratory
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
Files:
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Collection:
Department of Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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