Gigahertz ultrasound in single crystal superconducting YBa/sub 2/Cu/sub 3/O/sub 7/
作者： B. Golding , W.H. Haemmerle , L.F. Schneemeyer , J.V. Waszczak
DOI: 10.1109/ULTSYM.1988.49544
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摘要: Anisotropic sound propagation at 1 GHz in single-crystal YBa/sub 2/Cu/sub 3/O/sub 7/ is described. Longitudinal phonons have been studied from 0.01 K to 300 K, with emphasis on the temperature region near superconducting transition T/sub c/ 88 K. A discontinuous velocity observed for parallel and perpendicular c axis. Strain derivatives of are evaluated using mean field theory. Below temperature-dependent has positive slope, which indicates tunneling defects. >
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