Non-exponential relaxation and the distribution of the second-order transverse anisotropic parameters in Mn 12

Z.-D. Chen () and S.-Q. Shen

The European Physical Journal B: Condensed Matter and Complex Systems, 2005, vol. 48, issue 3, 405-408

Abstract: The Landau-Zener multi-crossing relaxation in Mn 12 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. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Date: 2005
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DOI: 10.1140/epjb/e2005-00412-0

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