Comment on "Magnetoelastic model for the relaxation of lanthanide ions in YBa2Cu3O7-delta observed by neutron scattering" - art. no. 066501

Lovesey and Staub have argued [S.W. Lovesey and U. Staub, Phys. Rev. B 61, 9130 (2000)] that experimental data on the temperature dependence of the pa ramagnetic relaxation of lanthanide ions doped into YBa2Cu3O6+x are in agre ement with the predictions of a model that describes the relaxation as due to the scattering of phonons via a magnetoelastic interaction. By generaliz ing their model I show that the level of agreement is strongly dependent on the number of intermediate lanthanide energy levels included in the calcul ation, and that inclusion of a more complete set of levels leads to very di fferent results that do not necessarily support the phonon damping picture.