Comment on "Magnetoelastic model for the relaxation of lanthanide ions in YBa2Cu3O7-d observed by neutron scattering"

Details Comment on "Magnetoelastic model for the relaxation of lanthanide ions in YBa2Cu3O7-d observed by neutron scattering" Comment on "Magnetoelastic model for the relaxation of lanthanide ions in YBa2Cu3O7-d observed by neutron scattering"

2001-05-01

arxiv.org/abs/cond-mat/0105011v1

Phys. Rev. B 64 (2001) 066501

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.64.066501

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 paramagnetic relaxation of lanthanide ions doped into YBa2Cu3O6+x are in agreement with the predictions of a model that describes the relaxation as due to the scattering of phonons via a magnetoelastic interaction. By generalising their model I show that the level of agreement is strongly dependent on the number of intermediate lanthanide energy levels included in the calculation, and that inclusion of a more complete set of levels leads to very different results that do not necessarily support the phonon damping picture.

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