Vesignieite: An S=1/2 Kagome Antiferromagnet with Dominant Third-Neighbor Exchange

Boldrin, D. , Fåk, B., Canévet, E., Ollivier, J., Walker, H.C., Manuel, P., Khalyavin, D.D. and Wills, A.S. (2018) Vesignieite: An S=1/2 Kagome Antiferromagnet with Dominant Third-Neighbor Exchange. Physical Review Letters, 121, 107203. (doi: 10.1103/physrevlett.121.107203) (PMID:30240241)

Abstract

The spin-1/2 kagome antiferromagnet is an archetypal frustrated system predicted to host a variety of exotic magnetic states. We show using neutron scattering measurements that deuterated vesignieite BaCu3V2O8(OD)2, a fully stoichiometric S=1/2 kagome magnet with <1% lattice distortion, orders magnetically at TN=9  K into a multi-k coplanar variant of the predicted triple-k octahedral structure. We find that this structure is stabilized by a dominant antiferromagnetic third-neighbor exchange J3 with minor first- or second-neighbor exchanges. The spin-wave spectrum is well described by a J3-only model including a tiny symmetric exchange anisotropy.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Boldrin, Dr David
• Authors: Boldrin, D., Fåk, B., Canévet, E., Ollivier, J., Walker, H.C., Manuel, P., Khalyavin, D.D., and Wills, A.S.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114
• Copyright Holders: Copyright © 2018 American Physical Society
• First Published: First published in Physical Review Letters 121:107203
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher