Phase Transition in a Phonon Gas With Pair Correlations
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Abstract
The phase transition to the state of a phonon gas with pairwise correlations of interacting phonons with opposite momenta is studied. A method for describing such phonon systems within the framework of the self-consistent field model is developed and their thermodynamic characteristics are calculated. It is shown that a phonon gas with pair correlations can exist in a state of unstable thermodynamic equilibrium. The possibility of experimental observation of a solid in such a phase is discussed. PACS numbers: 05.30.Jp, 05.70.Fh, 63.20.-e, 63.20.K, 63.20.Ry, 65.40.-b, 67.80.-s
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