Gigahertz ultrasound in single crystal superconducting YBa2Cu3O7

Brage Golding, W. H. Haemmerle, L. F. Schneemeyer, J. V. Waszczak

Research output: Contribution to journalConference article

11 Scopus citations

Abstract

Anisotropic sound propagation at 1 GHz in single-crystal YBa2Cu3O7 is described. Longitudinal phonons have been studied from 0.01 K to 300 K, with emphasis on the temperature region near the superconducting transition Tc at 88 K. A discontinuous sound velocity is observed at Tc for propagation parallel and perpendicular to the c axis. Strain derivatives of Tc are evaluated using mean field theory. Below 1 K the temperature-dependent sound velocity has positive slope, which indicates tunneling of defects.

Original languageEnglish
Pages (from-to)1079-1083
Number of pages5
JournalUltrasonics Symposium Proceedings
Volume2
StatePublished - 1 Dec 1988
EventIEEE 1988 Ultrasonics Symposium - Proceedings - Chicago, IL, USA
Duration: 2 Oct 19885 Oct 1988

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