Eur. Phys. J. B 48, 405-408 (2005)
https://doi.org/10.1140/epjb/e2005-00412-0

Non-exponential relaxation and the distribution of the second-order transverse anisotropic parameters in Mn₁₂

¹ 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 zhidechen@21cn.com

Received: 22 July 2005
Published online: 23 December 2005

Abstract

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.