Muon spin relaxation in NaV2O5

Muon-spin relaxation measurements have been carried out on NaV2O5 in the temperature range from 6 up to 300 K, through the spin-Peierls transition temperature at T-SP = 33 K. The relaxation is fitted throughout to a stretched exponential, exp( - (lambda(T)t)(beta(T))). The parameter beta is greater than 1 above the transition, but falls surprisingly to below 1/3 at 6 K, as usually observed in frustrated magnetic systems. (C) 2000 Elsevier Science B.V. All rights reserved