• Anomalies in second order elastic constants and gyrotropic constants of triglycine sulphate near phase transition

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    • Keywords


      Elastic anomalies; gyrotropic constants; phase transition; triglycine sulphate

    • Abstract


      The anomalies in second order elastic constants and gyrotropic constants have been considered for the phase transition of triglycine sulphate. Expressions have been derived for the equilibrium values of order parameter and strain variables in both phases. Using Landau-Khalatnikov equation the fluctuation in order parameter is expressed in terms of fluctuations in strain variables. Substitution of these in free energy gives anomalies arising from Landau and coupling energies in second order elastic constants. The real part of the anomalies decreases steeply across the transition temperature and thereafter flatly tend to ferroelectric values. The anomalies in the components of the gyrotropic tensor have been derived and their temperature variation discussed.

    • Author Affiliations


      B Subramanyam1 K S Viswanathan1

      1. Department of Physics, Indian Institute of Technology, Madras - 600 036, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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