Abstract
The isothermal elastic constants and the coefficient of anomalous thermal expansion of a magnetic lattice are discussed. The spin system is described by the Ising model with an exchange coupling depending on lattice spacing. A behavior of the elastic constants and the coefficient of thermal expansion is found which is in qualitative agreement with experiments. The isothermal compressibility remains positive nearT c and no thermo-mechanical instability occurs (which would lead to a first-order phase transitions), in contrast to earlier theories.
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Work supported by the U.S. National Science Foundation.
We would like to thank Prof. J. W. Kane for many useful discussions.
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Wagner, H., Swift, J. Elasticity of a magnetic lattice near the magnetic critical point. Z. Physik 239, 182–196 (1970). https://doi.org/10.1007/BF01398476
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DOI: https://doi.org/10.1007/BF01398476