Ultrasonic study of magnetoelastic effects in Pr1−xCaxMnO3

Abstract We present ultrasonic measurements on magnetoresistance manganites Pr 1− x Ca x MnO 3 ( x =0.35,0.5) in magnetic fields up to 27 T. Charge ordering occurs in Pr 1− x Ca x MnO 3 in the 0.35 x 0.5 Ca 0.5 MnO 3 is accompanied with a large hysteresis which extends up to 20 T at the lowest temperatures (2 K). The field dependence of the longitudinal sound velocity measured on polycrystalline samples are reported and the magnetic diagram is determined.