Abstract
1H-NMR study of a molecular magnet K 6[V 15As 6O 42(H 2O)]8H 2O (in short, V15) provides evidences for a gradual slowing of fluctuations of the V 4+ spins with increasing magnetic field. The temperature and magnetic field dependence of 1/ T 1 is well explained by a model in terms of spin phonon interaction in the magnetic field region ( H>2.7 T) where the ground state of the V15 cluster is S = 3 2 . On the other hand, the T 1 data is not reproduced by the model in the low magnetic field region where the ground state is formed by two S = 1 2 doubly degenerate states, suggesting importance of additional contribution to the spin dynamics of V 4+ moments due to peculiarities of the S = 1 2 triangle configuration in the V15 cluster.
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