Abstract
We present a comprehensive theory of the magnetization relaxation ina Mn12-acetate crystal based on thermally assistedspin tunneling induced by quartic anisotropy and weak transversemagneticfields.The overall relaxation rate as a function of the magnetic fieldis calculated and shown to agree well with data including allresonance peaks. The Lorentzian shape of the resonances is alsoin good agreement with recent data.A generalized master equation including resonances is derivedand solved exactly. It is shown that many transition paths withcomparable weight exist that contribute to the relaxation process.Previously unknown spin-phonon coupling constants are calculatedexplicitly.
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