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Title: Evidence for a gapped spin-liquid ground state in a kagome Heisenberg antiferromagnet

Abstract

The kagome Heisenberg antiferromagnet is a leading candidate in the search for a spin system with a quantum spin-liquid ground state. The nature of its ground state remains a matter of active debate. We conducted oxygen-17 single-crystal nuclear magnetic resonance (NMR) measurements of the spin-1/2 kagome lattice in herbertsmithite [ZnCu3(OH)6Cl2], which is known to exhibit a spinon continuum in the spin excitation spectrum.We demonstrated that the intrinsic local spin susceptibility ckagome, deduced from the oxygen-17 NMR frequency shift, asymptotes to zero below temperatures of 0.03J, where J ~ 200 kelvin is the copper-copper superexchange interaction. Combined with the magnetic field dependence of ckagome that we observed at low temperatures, these results imply that the kagome Heisenberg antiferromagnet has a spin-liquid ground state with a finite gap.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1352864
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 350; Journal Issue: 6261; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English

Citation Formats

Fu, M., Imai, T., Han, T. -H., and Lee, Y. S. Evidence for a gapped spin-liquid ground state in a kagome Heisenberg antiferromagnet. United States: N. p., 2015. Web. doi:10.1126/science.aab2120.
Fu, M., Imai, T., Han, T. -H., & Lee, Y. S. Evidence for a gapped spin-liquid ground state in a kagome Heisenberg antiferromagnet. United States. doi:10.1126/science.aab2120.
Fu, M., Imai, T., Han, T. -H., and Lee, Y. S. Thu . "Evidence for a gapped spin-liquid ground state in a kagome Heisenberg antiferromagnet". United States. doi:10.1126/science.aab2120.
@article{osti_1352864,
title = {Evidence for a gapped spin-liquid ground state in a kagome Heisenberg antiferromagnet},
author = {Fu, M. and Imai, T. and Han, T. -H. and Lee, Y. S.},
abstractNote = {The kagome Heisenberg antiferromagnet is a leading candidate in the search for a spin system with a quantum spin-liquid ground state. The nature of its ground state remains a matter of active debate. We conducted oxygen-17 single-crystal nuclear magnetic resonance (NMR) measurements of the spin-1/2 kagome lattice in herbertsmithite [ZnCu3(OH)6Cl2], which is known to exhibit a spinon continuum in the spin excitation spectrum.We demonstrated that the intrinsic local spin susceptibility ckagome, deduced from the oxygen-17 NMR frequency shift, asymptotes to zero below temperatures of 0.03J, where J ~ 200 kelvin is the copper-copper superexchange interaction. Combined with the magnetic field dependence of ckagome that we observed at low temperatures, these results imply that the kagome Heisenberg antiferromagnet has a spin-liquid ground state with a finite gap.},
doi = {10.1126/science.aab2120},
journal = {Science},
issn = {0036-8075},
number = 6261,
volume = 350,
place = {United States},
year = {2015},
month = {11}
}

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    Works referencing / citing this record:

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