• Sound attenuation in doped displacive ferroelectrics

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    • Keywords


      Displacive ferroelectrics; anharmonicity and electric dipolemoment; attenuation constant; Curie temperature

    • Abstract


      An expression is obtained for the sound attenuation constant in a doped displacive ferroelectrics in the presence of an external electric field, using double-time temperature-dependent Green’s function technique. The mass and force constant changes due to impurity atoms, are taken into account along with higher order anharmonic and electric dipole moment terms, in the Silverman-Joseph Hamiltonian. The attenuation constant increases with an external electric field. The soft mode is responsible for the anomalously increasing behaviour of the attenuation constant in the vicinity of the Curie temperature. The results agree with those attained by Tani and Tsuda and Heuter and Neuhaus.

    • Author Affiliations


      U C Naithani1 2 B S Semwal1

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

  • Pramana – Journal of Physics | News

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