Muon spin relaxation and susceptibility studies of the pure and diluted spin 1/2 Kagome-like lattice system (CuxZn1-x)3V2O7(OH2) 2H2O -: art. no. 207603

Muon spin relaxation and magnetic susceptibility measurements have been performed on the pure and diluted spin 1/2 kagome system (CuxZn1-x)(3)V2O7(OH)(2) 2H(2)O. In the pure x=1 system we found a slowing down of Cu spin fluctuations with decreasing temperature towards Tsimilar to1 K, followed by slow and nearly temperature-independent spin fluctuations persisting down to T=50 mK, indicative of quantum fluctuations. No indication of static spin freezing was detected in either of the pure (x=1.0) or diluted samples. The observed magnitude of fluctuating fields indicates that the slow spin fluctuations represent an intrinsic property of kagome network rather than impurity spins.