Title :
Sound behavior in high Tc superconductor Bi-Sr-Ca-Cu-O
Author :
Sun, K.J. ; Parker, F.R. ; Winfree, W.P. ; Syed, H.I. ; Meng, R.L. ; Sun, Y.Y. ; Hor, P.H. ; Chu, C.W.
Author_Institution :
Dept. of Phys., Coll. of William & Mary, Williamsburg, VA, USA
Abstract :
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 Tc, also observed in other 90-K high-T 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
Keywords :
bismuth compounds; calcium compounds; high-temperature superconductors; spin-phonon interactions; strontium compounds; superconducting transition temperature; ultrasonic absorption; ultrasonic velocity; 10 MHz; 90 K; Bi-Sr-Ca-Cu-O; attenuation anomalies; high Tc superconductor; high-temperature superconductors; intrinsic properties; spin-phonon interaction; superconducting phase transitions; temperature dependent ultrasound measurements; two-phased sintered sample; velocity changes; Attenuation; Electric variables measurement; Frequency measurement; Magnetic susceptibility; Particle measurements; Phase measurement; Temperature distribution; Time measurement; Ultrasonic variables measurement; Volume measurement;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171571
