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

Boldrin, D; Fak, B; Canevet, E; Ollivier, J; Walker, HC; Manuel, P; Khalyavin, DD; (2018) Vesignieite: An S=1/2 Kagome Antiferromagnet with Dominant Third-Neighbor Exchange. Physical Review Letters , 121 (10) 10.1103/PhysRevLett.121.107203. Green open access

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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 BaCu 3 V 2 O 8 ( OD ) 2 , a fully stoichiometric S = 1 / 2 kagome magnet with < 1 % lattice distortion, orders magnetically at T N = 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 J 3 with minor first- or second-neighbor exchanges. The spin-wave spectrum is well described by a J 3 -only model including a tiny symmetric exchange anisotropy.

Type: Article
Title: Vesignieite: An S=1/2 Kagome Antiferromagnet with Dominant Third-Neighbor Exchange
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.121.107203
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.121.107203
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, QUANTUM SPIN LIQUID, MAGNETIC EXCITATIONS, ORBITAL FRUSTRATION, STATE, BACU3V2O8(OH)(2), VOLBORTHITE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10056932
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