K. Sun, F. R. Parker, W. Winfree, H. I. Syed, R. Meng, Y. Sun, P. Hor, C. Chu
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Sound behavior in high T/sub c/ superconductor Bi-Sr-Ca-Cu-O
Temperature-dependent ultrasound measurements were performed on a two-phased sintered sample of Bi-Sr-Ca-Cu-O. Attenuation anomalies and velocity changes were observed for 10-MHz longitudinal waves around the two superconducting phase transitions. These features of sound behavior at T/sub c/, also observed in other 90-K high-T/sub c/ systems, may result from the direct interaction of intrinsic properties of high-temperature superconductors with sound. A spin-phonon interaction is proposed to interpret the acoustic behavior.<>
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