On the theory of the central peak at structural phase transitions |
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| Authors: | V. L. Aksenov M. Bobeth N. M. Plakida J. Schreiber |
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| Affiliation: | (1) Joint Institute for Nuclear Research, SU-141980 Dubna, USSR;(2) Abteilung für Physik, Sektion Physik Theoretische Physik, Technische Universität, Mommsenstrasse 13, DDR-8027 Dresden, German Democratic Republic |
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| Abstract: | A universal mechanism is proposed, which explains the appearance of the central peak by means of a transition from ergodic to nonergodic dynamical behaviour of the system at some temperatureTg above the phase transition. A detailed investigation of the scalar lattice  4-model with defects is given. The relation between the nonergodic state and the appearance of precursor clusters and Raman scattering experiments is discussed. |
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