  Volborthite compound is one of the very few realizations of S=1/2 quantum
spins on a highly frustrated kagome-like lattice. Low-T SQUID measurements
reveal a broad magnetic transition below 2K which is further confirmed by a
peak in the 51V nuclear spin relaxation rate (1/T1) at 1.4K$\pm$0.2K. Through
51V NMR, the ground state (GS) appears to be a mixture of different spin
configurations, among which 20% correspond to a well defined short range order,
possibly of the $\sqrt{3} \times \sqrt{3}$ type. While the freezing involve all
the Cu$^{2+}$ spins, only 40% of the copper moment is actually frozen which
suggests that quantum fluctuations strongly renormalize the GS.
