Abstract
Ultrasonic longitudinal and shear velocities in polycrystalline PrBa 2Cu 3O 7− δ with an oxygen content of O 6.9 and O 6.5 were measured at 10 MHz between 80 and 300 K. Longitudinal velocity hysteresis was observed between 190 and 230 K in the O 6.9 (orthorhombic) sample but not in the O 6.5 (tetragonal) sample. Micrographs obtained from scanning electron microscopy showed no noticeable difference in the microstructure of the samples under investigation. These results are explained in terms of possible oxygen ordering. By comparing our results with previous ultrasonic studies on the related materials which show superconducting properties, it is concluded that the oxygen content strongly influence the elastic property and the longitudinal velocity hysteresis.
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