• Propagation of longitudinal ultrasonic waves in RbH2PO4 near its ferroelectric phase transition temperature

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    • Keywords


      Ferroelectricity; phase transition; ultrasonic attenuation and velocity change; soft mode; RbH2PO4

    • Abstract


      Ferroelectric phase transition in RbH2PO4 has been investigated using propagation of longitudinal acoustic waves along the polar axis near the transition temperature. The velocity of this mode is continuous across the transition temperature. Velocity data in the ferroelectric phase are analyzed in terms of coupled soft modeacoustic mode model of Pytte to obtain the temperature dependence of the soft mode frequency. The attenuation data in the ferroelectric phase show power law dependence. It follows scaling behaviour of the type predicted by Kawasaki from the mode-mode coupling theory and the dynamical scaling.

    • Author Affiliations


      G P Singh1 B K Basu1

      1. Tata Institute of Fundamental Research, Bombay - 400 005
    • Dates

  • Pramana – Journal of Physics | News

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