Ultrasonic studies of textured superconducting Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y} in magnetic fields

Conference · Mon Jul 01 00:00:00 EDT 1996

OSTI ID:438531

Wang, Q; Almond, D P; Saunders, G A ^[1]; Palmer, S B; Lim, C M ^[2]; Goretta, K C ^[3]

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1. Bath Univ. (United Kingdom)
2. Warwick Univ., Coventry (United Kingdom). Dept. of Physics
3. Argonne National Lab., IL (United States)

Measurements have been made of ultrasonic shear wave attenuation and sound velocity in highly textured polycrystalline samples of Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+y] in magnetic fields up to 9 tesla and at temperatures down to 4.2 K. Magnetic field dependent attenuation peaks and velocity enhancements were found that are in good agreement with theoretical predictions based on the assumptions of the thermally assisted flux flow model of the mixed state. A pinning activation energy of approximately 160 K was deduced from the ultrasonic data. Pinning energy showed little evidence of dependence upon magnetic field magnitude or orientation. The flux-line lattice was found to be pinned fully at lowest temperatures.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 438531
• Report Number(s): ANL/ET/CP-91684; CONF-960722-1; ON: DE97001158
• Resource Relation: Conference: 11. international conference on internal friction and ultrasonic attenuation in solids, Poitiers (France), 7-11 Jul 1996; Other Information: PBD: Jul 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ULTRASONIC WAVES
ATTENUATION
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
MAGNETIC FLUX
BISMUTH OXIDES
STRONTIUM OXIDES
CALCIUM OXIDES
COPPER OXIDES
TEMPERATURE DEPENDENCE
CRYSTAL LATTICES
ACTIVATION ENERGY
SUPERCONDUCTIVITY
MEASURING METHODS