  We report the study of high quality samples of the frustrated S = 1/2 kagome
antiferromagnet vesignieite, Cu3Ba(VO5H)2. Neutron powder diffraction
measurements evidence the high quality of the kagome lattice and show no sign
of a transition to long-range order. A kink in the susceptibility below T = 9 K
is matched to a reduction in paramagnetic-like correlations in the diffraction
data and a slowing of the spin dynamics observed by MuSR. Our results point to
an exotic quantum state below 9 K with coexistance of both dynamical and small
frozen moments \sim 0.1 \muB. We propose that Dzyaloshinsky-Moriya interaction
is large enough in this system to stabilize this novel quantum ground state.
