Soft phonons and the central mode at structural phase transitions |
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Authors: | P.F. Meier |
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Affiliation: | IBM Zurich Research Laboratory, 8803 Rüschlikon-ZH, Switzerland |
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Abstract: | Applying Landau's quasi-particle picture to an interacting phonon system it is shown that the softening of phonon modes is connected with an enhancement of the quasi-particle interaction. This in turn leads to a critical slowing-down of fluctuations around local equilibrium which may give rise to an additional central peak in the scattering function. |
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