Tunneling Splittings in Mn12-Acetate Single Crystals
E. del Barco, A. D. Kent, E. M. Rumberger, D. N. Hendrickson, G. Christou
Abstract
A Landau-Zener multi-crossing method has been used to investigate the tunnel splittings in high quality Mn12-acetate single crystals in the pure quantum relaxation regime and for fields applied parallel to the magnetic easy axis. With this method several individual tunneling resonances have been studied over a broad range of time scales. The relaxation is found to be non-exponential and a distribution of tunnel splittings is inferred from the data. The distributions suggest that the inhomogeneity in the tunneling rates is due to disorder that produces a non-zero mean value of the average transverse anisotropy, such as in a solvent disorder model. Further, the effect of intermolecular dipolar interaction on the magnetic relaxation has been studied.
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