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Zeitschrift für Physik B Condensed Matter

, Volume 78, Issue 2, pp 207–212 | Cite as

Propagation of ultrasonic waves and anomalies nearTc in single crystalline YBa2Cu3O7−x high-Tc superconductors

  • T. J. Kim
  • J. Kowalewski
  • W. Assmus
  • W. Grill
Article

Abstract

The attenuation and the velocity of ultrasonic waves in single crystalline high-Tc YBa2Cu3O7−x have been measured in the temperature range from 3 to 280 K for the C11-, C33-, C44- and C66-mode. At the superconducting transition a pronounced peak in the absorption is observed for the longitudinal C11-mode. The longitudinal C11- and C33-modes and the transverse C44-mode exhibit a plateau in the temperature dependence of the velocity. The temperature dependence of the absorption of the transverse C44-mode reveals a change in the slope atTc. The data are compared with the predictions derived from a thermodynamic treatment and with the results of measurements on coarse grain and fine grain sintered and sinter-forged materials.

Keywords

Spectroscopy Neural Network Attenuation State Physics Complex System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • T. J. Kim
    • 1
  • J. Kowalewski
    • 1
  • W. Assmus
    • 1
  • W. Grill
    • 1
  1. 1.Physikalisches InstitutJohann Wolfgang Goethe-UniversitätFrankfurtGermany

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