Critical Anomaly of the Third-Order Elastic Constants in CsPbCl3

  • Yamamoto Ikuo
    Department of Physics, Faculty of Education, Yokohama National University
  • Hirotsu Shunsuke
    Department of Biological Sciences, Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology

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  • Critical Anomaly of the Third-Order Elastic Constants in CsPbCl<SUB>3</SUB>
  • Critical Anomaly of the Third Order Ela

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Ultrasonic wave velocities of perovskite-type crystal CsPbCl3 have been measured above the cubic-tetragonal phase transition temperature under hydrostatic pressure. The combinations of third-order elastic constants C111+2C112, C111C123 and C144+2C166 were deduced from pressure derivatives of the sound velocity over the temperature interval 47–100°C. Critical anomalies were found in the temperature dependence of C111+2C112 and C111C123. It is shown that the order-parameter fluctuation is responsible for the observed anomaly in the third-order elastic constants.

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