Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session T29: Identifying Magnetic Ground States and Impurities in Quantum Spin Liquid Candidates
11:30 AM–2:30 PM,
Thursday, March 17, 2022
Room: McCormick Place W-190B
Sponsoring Units: GMAG DCMP
Chair: Stewart Brown, UCLA
Abstract: T29.00004 : 17-O NMR site-selective study of the quantum kagome antiferromagnet ZnCu3(OH)6Cl2 : a gapless ground state.*
1:18 PM–1:54 PM
(Indian Institute of Technology)
(Univ. Grenoble Alpes)
Here, we present site-resolved 17O NMR experiments on herbertsmithite single crystals using contrast methods analogous to MRI ones, which clearly separate slow from fast relaxing sites. The 17O nucleus being a very sensitive probe of the kagome planes, the spectral analysis yield different signatures for these sites and unambiguously shows that interlayer defects, initially thought to behave as independent paramagnetic spins also impact the physics of the kagome planes. We attribute the fast relaxing and gapless spectral contribution representing a ~70-75% fraction to O probing the least impurity-disturbed Cu sites. This, in our opinion, strongly argues in favor of a gapless model for the KHAF. Our results will be put into perspective of other experiments especially recent Cu NQR and specific heat ones.
*This project is supported by Agence Nationale de la recherche: SPINLIQ (ANR-12-BS04-0021), LINK (ANR-18-CE30-0022) and Marie Curie International Incoming Fellowship (PIIF-GA-2013-627322).
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