Abstract
We investigate the effect of phonons on the phase transition of exchange induced Van Vleck paramagnets. We approximate the full crystalline-field level scheme of the magnetic ions by two singlet levels. It is shown that the coupling of the magnetic excitations to the phonons reduces appreciably the temperature dependence of the former near the ordering temperatureT c . Special attention is focussed on Pr3Tl and it is discussed to what extent the present mechanism might explain recent inelastic neutron-scattering data.
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The author thanks all members of the Institute Max v. Laue-Paul Langevin. Garching, especially Prof. Dr. P. Fulde for proposing the problem and Dr. I. Peschel for numerous clarifying discussions and careful reading of the manuscript.
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Hoenerlage, B. Spin-phonon coupling in Van Vleck paramagnets. Z. Physik 260, 403–416 (1973). https://doi.org/10.1007/BF01397965
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DOI: https://doi.org/10.1007/BF01397965