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Vesignieite: An<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math>Kagome Antiferromagnet with Dominant Third-Neighbor Exchange
The spin-$\frac{1}{2}$ 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 ${\mathrm{BaCu}}_{3}{\mathrm{V}}_{2}{\mathrm{O}}_{8}(\mathrm{OD}{)}_{2}$, a fully stoichiometric $S=1/2$ kagome magnet with $<1%$ lattice distortion, orders magnetically at ${T}_{N}=9\text{ }\text{ }\mathrm{K}$ into a multi-$\mathbf{k}$ coplanar variant of …