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Theory of Anharmonic Crystals. I. General Formulation
Author(s) -
Plakida N. M.,
Siklós T.
Publication year - 1969
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19690330107
Subject(s) - anharmonicity , lattice (music) , lattice vibration , crystal (programming language) , physics , harmonic , basis (linear algebra) , function (biology) , quantum mechanics , condensed matter physics , statistical physics , classical mechanics , mathematics , phonon , geometry , computer science , evolutionary biology , acoustics , biology , programming language
The theory of lattice dynamics of an anharmonic crystal is developed without using the harmonic approximation as starting point. On the basis of the double‐time Green's function method the self‐consistent system of equations determining the equilibrium parameters of the lattice, the vibrational frequency and their damping is obtained. The free energy and the internal energy of an anharmonic crystal are calculated.