Journal
PHYSICAL REVIEW B
Volume 84, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.024412
Keywords
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Funding
- FEDER-MICINN [MAT2008-06542-C04-03]
- FICYT
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A theoretical model including both crystal-field and exchange interactions that considers the effect of magnetic fluctuations is developed to evaluate the temperature dependence of the isothermal magnetic entropy changes in ferromagnetic rare-earth-based intermetallic compounds. The Green's functions are derived from their equation of motion. The magnetic moment correlation functions are determined beyond the random phase approximation by incorporating a measure of magnetic spontaneous fluctuations in a way that ensures self-consistency with regard to the fluctuation-dissipation theorem. In particular, the exact magnitude of the entropy change without magnetic moment fluctuations depends on the ratio of both the crystal-field first-and the crystal-field third-order magnetic susceptibilities at the Curie temperature, T-C. These theoretical predictions are compared with experimental data on cubic RM2 (R = rare earth and M = Al and Ni) compounds, where the principal crystal-field and exchange parameters are well known.
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