HC1and BCS energy gap from low field ultrasonic measurements on melt‐textured YBa2Cu3O7
作者:
Zheng‐Xiao Li,
Salem‐ Sugui{pp},
Donglu Shi,
M. Levy,
Bimal K. Sarma,
期刊:
AIP Conference Proceedings
(AIP Available online 1992)
卷期:
Volume 286,
issue 1
页码: 141-146
ISSN:0094-243X
年代: 1992
DOI:10.1063/1.44742
出版商: AIP
数据来源: AIP
摘要:
Ultrasonic attenuation and velocity measurements have been performed on melt‐textured YBa2Cu3O7. In low magnetic field sweeps at constant temperatures, one sees sharp changes in both the velocity and the attenuation at the lower critical field. The attenuation jump per vortex can be fit to a Debye relaxation formula and the temperature dependence of the relaxation time in the superconducting state can be determined. The final results appear to be consistent with BCS energy gap &Dgr;(0)=1.76 kBTC.
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