Vesignieite: An S=1/2 Kagome Antiferromagnet with Dominant Third-Neighbor Exchange.
Phys Rev Lett
; 121(10): 107203, 2018 Sep 07.
Article
en En
| MEDLINE
| ID: mdl-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 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.
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MEDLINE
Tipo de estudio:
Prognostic_studies
Idioma:
En
Año:
2018
Tipo del documento:
Article