Nonlinear coupling and relaxation of fluctuations and the central peak |
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Authors: | Jens Feder |
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Institution: | IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, U.S.A. |
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Abstract: | A simple model Hamiltonian for a structural phase transition is discussed. It is shown that using the modecular field approximation one obtains a nonlinear coupling of the order parameter and entropy fluctuations. This results in a central peak in the order parameter fluctuation spectrum. The width of the central peak is proportional to the entropy relaxation rate. |
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