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    • Keywords


      Lattice dynamics; phase transition; soft mode; nonlinear dynamics

    • Abstract


      The dynamics of the nonlinear excitations in a two-dimensional (2D) φ4-diatomic lattice, with nonlinear on-site electron-phonon coupling at the polarizable ion site has been presented, without considering the self consistent phonon approximation. One of the major results obtained from our calculations is in the understanding of continuous structural phase transition, where we have obtained the minimum in soft mode frequency at a soft mode temperatureTs (>Tc), not at critical temperatureTc. This occurs due to the anisotropy of such 2D systems.

    • Author Affiliations


      Nabonita D Chowdhury1 Sankar P Sanyal1

      1. Department of Physics, C V Raman Building, Barkatullah University, Bhopal - 462 026, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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