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    • Keywords


      Nonlinear lattice dynamics; rare earth compounds

    • Abstract


      A nonlinear lattice dynamical theory is proposed to explain the mode softening in intermediate valence compound Sm0.75 Y0.25 S. In this theory we consider the breathing motion of the electron shells of Sm-ion to be nonlinear, and depend on temperature, resulting in strong electron-ion coupling. We calculate the salient features of the nonlinear breathing potential, which resembles theφ4 potential for second order ferro-electric transitions. We also calculate the temperature dependence of LO(L) frequency for this compound, showing that at transition temperature (about 200 K) this mode freezes.

    • Author Affiliations


      Nabonita Deb Chowdhury1 Sankar P Sanyal1

      1. Department of Physics, Materials Research Laboratory, 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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