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Spin dynamics in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:mrow></mml:math>quantum kagome compound vesignieite, Cu<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Ba(VO<mml:math …
We report the study of high-quality samples of the frustrated $S=\frac{1}{2}$ 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 …