Thermodynamics of mesoscopic soft modes in strongly disturbed lattices
A generalized Lifshitz procedure is developed, which allows the evaluation of frequency densities in mesoscopically disturbed harmonic lattices. Archetypical examples are calculated explicitly. In particular it is shown that lattice softening at mesoscopically distant sites produces a low-frequency enhancement of the increase in mode density, which may be ascribed to the oscillation of mesoscopically large masses. Possible relevance for the anomalous low-temperature behaviour of amorphous systems is discussed.
Year of publication: |
1990
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Authors: | Wagner, Max ; Mougios, Theodor |
Published in: |
Physica A: Statistical Mechanics and its Applications. - Elsevier, ISSN 0378-4371. - Vol. 166.1990, 2, p. 229-262
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Publisher: |
Elsevier |
Saved in:
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