Non-exponential relaxation and the distribution of the second-order transverse anisotropic parameters in Mn12
Department of Physics, The University of Hong Kong, Hong Kong, P.R. China
2 Department of Physics, Jinan University, Guangzhou 510632, P.R. China
Corresponding author: a firstname.lastname@example.org
Published online: 23 December 2005
The Landau-Zener multi-crossing relaxation in Mn12 molecule is studied based on the tunnel splitting obtained from the spin-coherent-state path integral including the local stray field. It is found that the spins with larger second-order transverse anisotropic parameters will finish the relaxation before the higher resonance is reached. Such a pre-relaxation seriously modifies the relaxation behavior at higher resonance and makes the distributions of the second-order transverse anisotropic parameters extracted from different resonances un-scaled. Our analysis shows that scaled distributions can be found from the relaxation curves of k=6 and k=7 resonance by including the effect of pre-relaxation.
PACS: 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.50.Xx – Molecular magnets
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005