Elasticity of a magnetic lattice near the magnetic critical point |
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Authors: | Herbert Wagner Jack Swift |
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Affiliation: | 1. Max-Planck-Institut für Physik und Astrophysik, München 2. Department of Physics, Harvard University, 02138, Cambridge, Mass.
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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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