Title: Collective excitations in the anharmonic crystal
Authors: Verbeure, AndrĂ© ×
Zagrebnov, Va #
Issue Date: May-1995
Series Title: Physica A. Statistical and Theoretical Physics vol:215 issue:3 pages:394-404
Abstract: We consider a lattice model of an anharmonic crystal and compute the isothermal (chi(T)) and adiabatic (chi(S)) susceptibilities for the lattice displacement below T-c. A detailed analysis is given in terms of the dimension of the lattice and a decay parameter of the harmonic force. It turns out that there is a phase-space region for which 0 < chi(T)/chi(S) < 1, indicating breaking of ergodicity, and a region for which chi(T) is finite, indicating the presence of a plasmon frequency due to the anharmonicity.
ISSN: 0378-4371
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Theoretical Physics Section
× corresponding author
# (joint) last author

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