Elastic constants of nonionic anharmonic crystals |
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Authors: | W Götze K H Michel |
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Institution: | 1. Max-Planck-Institut für Physik und Astrophysik, München 2. Institut Max von Laue-Paul Langevin, Garching bei München
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Abstract: | Taking into account the entire anharmonicity of the crystal an exact relation between the long-wavelength limit of the static self-energy and the isothermal elastic constants is established. The result can be reformulated as a sum rule for the displacement correlation function. The diagram technique is also employed to discuss the equation for the elastic constants in the pseudoharmonic approximation as well as to derive the integral equations for the quasiparticle parameters. |
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