Spin-phonon interactions in the compressible Ising magnet. II
- 30 July 1971
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 4 (10), 1178-1192
- https://doi.org/10.1088/0022-3719/4/10/026
Abstract
For pt.I see abstr. A62503 of 1970. An upper bound is found for the free energy of a compressible Ising system with spin-phonon interactions using the Gibbs-Bogolyubov inequality. The results are identified as a molecular field approximation. The thermodynamic behaviour of the system is compared with that of the Bean-Rodbell model. An instability in the magnetization suggestive of a first order transition occurs for sufficiently large values of the spin-phonon coupling parameter. The contribution of the spin-phonon interaction to the thermal expansion anomaly is also discussed.Keywords
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