• DocumentCode
    3460384
  • Title

    Gigahertz ultrasound in single crystal superconducting YBa2 Cu3O7

  • Author

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

  • Author_Institution
    AT&T Bell Lab., Murray Hill, NJ, USA
  • fYear
    1988
  • fDate
    2-5 Oct 1988
  • Firstpage
    1079
  • Abstract
    Anisotropic sound propagation at 1 GHz in single-crystal YBa2 Cu3O7 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
  • Keywords
    barium compounds; high-temperature superconductors; superconducting transition temperature; ultrasonic propagation; ultrasonic velocity measurement; yttrium compounds; 0.01 to 300 K; 1 GHz; YBa2Cu3O7; anisotropic sound propagation; defects tunneling; discontinuous sound velocity; gigahertz ultrasound; high temperature superconductors; longitudinal phonons; mean field theory; single crystal superconductor; strain derivatives; superconducting transition; temperature region; Acoustic measurements; Acoustic propagation; Attenuation; Frequency; Magnetic films; Piezoelectric films; Superconducting coils; Superconducting transmission lines; Ultrasonic imaging; Zinc oxide;
  • fLanguage
    English
  • Publisher
    ieee
  • Conference_Titel
    Ultrasonics Symposium, 1988. Proceedings., IEEE 1988
  • Conference_Location
    Chicago, IL
  • Type

    conf

  • DOI
    10.1109/ULTSYM.1988.49544
  • Filename
    49544
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=3460384