Title :
Surface acoustic wave investigation of mixed-state phases in YBa 2Cu3O7
Author :
Hucho, C. ; Feller, J. ; Gaffney, R. ; McKenna, M. ; Sarma, B. ; Levy, M.
Author_Institution :
Wisconsin Univ., Milwaukee, WI, USA
Abstract :
A technique was developed which allows for surface acoustic wave (SAW) experiments up to 500 MHz in YBCO single crystals and films on piezoelectric as well as non-piezoelectric substrates. Experimental data on a granular YBCO film show a field dependent attenuation peak below T c which is indicative of temperature dependent changes of the coupling of the magnetic vortex system to the crystal lattice and might be related to melting or depinning of the vortex lattice
Keywords :
barium compounds; flux pinning; flux-line lattice; granular materials; high-temperature superconductors; superconducting thin films; surface acoustic waves; ultrasonic absorption; yttrium compounds; 500 MHz; SAW; YBCO single crystals; YBa2Cu3O7; coupling; crystal lattice; depinning; field dependent attenuation peak; films; granular YBCO film; magnetic vortex system; melting; mixed-state phases; nonpiezoelectric substrates; piezoelectric substrates; surface acoustic wave; temperature dependent change; vortex lattice; Acoustic waves; Attenuation; Crystals; Lattices; Magnetic films; Piezoelectric films; Substrates; Surface acoustic waves; Temperature dependence; Yttrium barium copper oxide;
Conference_Titel :
Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2940-6
DOI :
10.1109/ULTSYM.1995.495640
