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    • Keywords


      Ferroelectrics; psendospin; soft mode; Green’s function; dielectric constant; tangent loss

    • Abstract


      Considering external electric field as well as third- and fourth-order phonon anharmonic interaction terms in the pseudospin-lattice coupled mode (PLCM) model Hamiltonian for KDP-type ferroelectrics, expressions for field-dependent shift, width, renormalized soft mode frequency, Curie temperature, dielectric constant and dielectric loss are evaluated. For the calculation, method of statistical double-time temperature-dependent Green’s function has been used. By fitting model values of physical quantities, temperature and electric field dependences of soft mode frequency, dielectric constant and loss have been calculated which compare well with experimental results of Baumgartner [8] and Choi and Lockwood [9]. Both dielectric constant and loss decrease with electric field.

    • Author Affiliations


      Trilok Chandra Upadhyay1 Ramendra Singh Bhandari1 Birendra Singh Semwal1

      1. Physics Department, H.N.B. Garhwal University, Srinagar (Garhwal), Uttaranchal - 246 174, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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