Order-Disorder, Tunnelling And Phonons In Structural Phase Transitions

S. Stamenkovic, N. M. Plakida, V. L. Aksenov, T. Siklos

Research output: Article

2 Citations (Scopus)

Abstract

Starting from a general Hamiltonian of pair-coupled anharmonic oscillators and using the concept of local normal cordinates, a unified dynamical theory of structural phase transitions is proposed. By making use of the variational procedure, the model pseudospin - phonon Hamiltonian, describing the statistical order-disorder, the tunnelling and the phonon vibrations of active atoms is formulated. The qualitative and the detailed numerical analysis show that the structural phase transition can be either of the order-disorder, or of the displacive or of the mixed type, depending on both the reduced lattice coupling strength and the zero-point vibrational energy.

Original languageEnglish
Pages (from-to)255-264
Number of pages10
JournalFerroelectrics
Volume24
Issue number1
DOIs
Publication statusPublished - jan. 1 1980

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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