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

Abstract

Here, 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 [ZnCu 3(OH) 6Cl 2], which is known to exhibit a spinon continuum in the spin excitation spectrum. We demonstrated that the intrinsic local spin susceptibility χkagome, 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 χ kagome 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:
 [1];  [2];  [3];  [4]
  1. McMaster Univ., Hamilton, ON (Canada)
  2. McMaster Univ., Hamilton, ON (Canada); Canadian Institute for Advanced Research, Toronto, ON (Canada)
  3. Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1263406
Report Number(s):
SLAC-PUB-16632
Journal ID: ISSN 0036-8075; arXiv:1511.02174
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
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
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; MATSCI

Citation Formats

Fu, Mingxuan, Imai, Takahashi, Han, Tian -Heng, and Lee, Young 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, Mingxuan, Imai, Takahashi, Han, Tian -Heng, & Lee, Young S. Evidence for a gapped spin-liquid ground state in a kagome Heisenberg antiferromagnet. United States. doi:10.1126/science.aab2120.
Fu, Mingxuan, Imai, Takahashi, Han, Tian -Heng, and Lee, Young S. Fri . "Evidence for a gapped spin-liquid ground state in a kagome Heisenberg antiferromagnet". United States. doi:10.1126/science.aab2120. https://www.osti.gov/servlets/purl/1263406.
@article{osti_1263406,
title = {Evidence for a gapped spin-liquid ground state in a kagome Heisenberg antiferromagnet},
author = {Fu, Mingxuan and Imai, Takahashi and Han, Tian -Heng and Lee, Young S.},
abstractNote = {Here, 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 χkagome, 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 χkagome 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},
number = 6261,
volume = 350,
place = {United States},
year = {Fri Nov 06 00:00:00 EST 2015},
month = {Fri Nov 06 00:00:00 EST 2015}
}

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