Abstract
Both the longitudinal and transverse ultrasonic sound velocities and attenuations in the single-phase polycrystalline compound La1−xCaxMnO3 (x=0.63,0.83) have been measured by a conventional pulse-echo-overlap technique at a frequency of 10 MHz, between 50 and 300 K. The variations with temperature of the Young modulus E, shear modulus G, bulk modulus B, Poisson’s ratio σ, and attenuation α have been determined. Anomalies in E, G, B, σ, and α were observed near the temperature of the charge-ordering transition TCO and antiferromagnetic (AFM) transition TN. The results imply a very strong spin–phonon interaction caused by linear magnetostriction near the AFM transition. The detailed form of the anomalies is different for different types of phase transitions.
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