Title :
Ultrasonic measurements in sinter-forged high Tc superconductor YBa2Cu3O7-δ
Author :
Xu, M.F. ; Schenstrom, A. ; Hong, Y. ; Bein, D. ; Sarma, Bimal K. ; Levy, M. ; Zhao, Z. ; Adenwalla, S. ; Moreau, A. ; Robinson, Q. ; Johnson, D.L. ; Hwu, S.J. ; Poeppelmeier, K.R. ; Ketterson, J.B.
Author_Institution :
Dept. of Phys., Wisconsin Univ., Milwaukee, WI, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
Both ultrasonic attenuation and velocity as a function of temperature from 4.2 K to room temperature were measured on sinter-forged samples of YBa2Cu3O7-δ , which have more than 80% alignment of the c-axis of the grains parallel to the forging axis. Strong anisotropy was found both in the attenuation and the velocity when propagating sound waves in different directions relative to the forging axis. Hysteresis was observed in the velocity changes
Keywords :
barium compounds; high-temperature superconductors; ultrasonic absorption; ultrasonic velocity; yttrium compounds; 4.2 to 293 K; US velocity; YBa2Cu3O7-δ; anisotropy; c-axis; high temperature superconductors; hysteresis; propagating sound waves; sinter-forged high Tc superconductor; temperature dependence; ultrasonic attenuation; Attenuation measurement; Cooling; Hysteresis; Phase measurement; Softening; Superconducting transition temperature; Temperature dependence; Time measurement; Ultrasonic variables measurement; Velocity measurement;
Journal_Title :
Magnetics, IEEE Transactions on
