Quantum fluctuations of the magnetization in high spin molecules - a mu SR study

Using zero field (ZF) and longitudinal field (LF) mu SR we study the magnetic properties of high spin molecules (HSM) with spin S = 15/2 and 27/2. The LF-mu SR at very low temperatures suggests that in both our samples dynamical field fluctuations are responsible for the muon relaxation. The relaxation rate lambda increases as the temperature decreases and then saturates below T 0 of the different samples is compared. (C) 2000 Elsevier Science B.V. All rights reserved