Ground state and intrinsic susceptibility of the kagome antiferromagnet vesignieite as seen by51V NMR

Quilliam, J.A., Bert, F., Colman, R.H., Boldrin, D. , Wills, A.S. and Mendels, P. (2011) Ground state and intrinsic susceptibility of the kagome antiferromagnet vesignieite as seen by51V NMR. Physical Review B, 84(18), 180401(R). (doi: 10.1103/PhysRevB.84.180401)

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Abstract

The intrinsic magnetic susceptibility and local magnetization of the near-kagome quantum magnet vesignieite, Cu 3 BaV 2 O 8 (OH) 2 , are presented as measured using 51 V NMR. The NMR line shift gives an accurate measurement of the intrinsic susceptibility of the kagome sites which closely resembles that of the quantum spin liquid herbertsmithite [A. Olariu et al., Phys. Rev. Lett. 100, 087202 (2008)]. It is therefore surprising that, at T C ≃ 9 K, a transition to a heterogeneous ground state is observed. A gradual wipeout of half the NMR intensity indicates a slowly fluctuating spin liquid component, and a detailed analysis of the linewidth reveals the onset of static magnetism at the remaining half of the sites. It is proposed that this transition and unusual ground state originate from a nearby quantum critical point induced by the Dzyaloshinskii-Moriya interaction.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Boldrin, Dr David
Authors: Quilliam, J.A., Bert, F., Colman, R.H., Boldrin, D., Wills, A.S., and Mendels, P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:1098-0121
ISSN (Online):1550-235X
Published Online:03 November 2011

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