Temperature-dependent sound velocities, attenuation and elastic moduli anomalies in Pr1− x Sr x MnO3 perovskite manganite materials at 0.28 ≤ X ≤ 0.41

Abstract

Pr1− x Sr x MnO3 perovskite manganite materials with different compositions of x (x = 0.28, 0.33, 0.35, 0.38 and 0.41) have been prepared using solid-state reaction technique. The ultrasonic longitudinal and shear velocities and longitudinal attenuation have been measured employing through transmission method operated at a fundamental frequency of 5 MHz over a wide range of temperatures. In all the compositions, the temperature-dependent sound velocities, attenuation and elastic constants show interesting anomalies at Curie temperature (T C) and Neel temperature (T N). The observed anomalies at T C and T N have been discussed in terms of phase transition, strength of linear magnetostriction effect and competition between paramagnetism and ferromagnetism.