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Recently Leuenbeger and Loss suggested a theory of phonon-assisted relaxationin a molecular nanomagnet Mn-12 that "contrary to previous results is inreasonably good agreement ... with all experimental parameter values known sofar". The purpose of this Comment is to show that the model of Leuenberger andLoss and its comparison with experiment are premised upon their incorrect useof the linear formula for the strain tensor. The spin-phonon couplingintroduced by Leuenberger and Loss disappears if the nonlinear term in thestrain tensor is taken into account.Comment: 2 pages, no figures, submitted to EP

europhysics letters

Crystal field − AS z 2 does not produce one-phonon transitions with Δ S z = ±2 (Comment on “Spin relaxation in Mn 12 -acetate” by M. N. Leuenberger and D. Loss)