• Sound velocity change in doped displacive ferroelectrics

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      https://www.ias.ac.in/article/fulltext/pram/014/01/0019-0023

    • Keywords

       

      Displacive ferroelectrics; soft mode; sound velocity; Curie temperature

    • Abstract

       

      An expression is obtained for the sound velocity change in doped displacive ferroelectrics, in the presence of an electric field by considering higher order anharmonic terms in the modified Silverman-Joseph Hamiltonian. The mass and force constant changes due to impurity may give cancellation effects. The presence of higher order anharmonicity decreases the sound velocity which in turn varies with the applied electric field. The sound velocity decreases anomalously near the Curie temperature.

    • Author Affiliations

       

      U C Naithani1 2 B S Semwal1

      1. Department of Physics, Garhwal University Campus, Srinagar - 246 174
      2. Department of Physics, Garhwal University Campus, Pauri - 246 001
    • Dates

       
  • Pramana – Journal of Physics | News

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