Spin dynamics in the S = 1/2 quantum kagome compound vesignieite, Cu3Ba(VO5H)2

Colman, R.H., Bert, F., Boldrin, D. , Hillier, A.D., Manuel, P., Mendels, P. and Wills, A.S. (2011) Spin dynamics in the S = 1/2 quantum kagome compound vesignieite, Cu3Ba(VO5H)2. Physical Review B, 83(18), 180416(R). (doi: 10.1103/PhysRevB.83.180416)

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Abstract

We report the study of high-quality samples of the frustrated S = 1 2 kagome antiferromagnet vesignieite, Cu 3 Ba(VO 5 H) 2 . Neutron powder diffraction measurements evidence the excellence of the kagome lattice and show no sign of a transition to magnetic long-range order. A kink in the susceptibility below T = 9 K is matched to a reduction in paramagnetic-like correlations in the diffraction data and a slowing of the spin dynamics observed by μ SR. Our results point to an exotic quantum state below 9 K with coexistence of both dynamical and small frozen moments ~ 0.1 μ B . We propose that this novel quantum ground state is stabilized by a large Dzyaloshinsky-Moriya interaction.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Boldrin, Dr David
Authors: Colman, R.H., Bert, F., Boldrin, D., Hillier, A.D., Manuel, P., Mendels, P., and Wills, A.S.
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:31 May 2011

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