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Surface acoustic wave measurements of YBa2Cu3O7-δ thin films and single crystals

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6 Author(s)
Gaffney, R. ; Physics Department, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201 ; Hucho, C. ; Feller, J.R. ; McKenna, M.J.
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Surface acoustic wave (SAW) velocity and attenuation measurements have been performed on high-temperature superconducting YBa2Cu3O7-δ (YBCO) thin films (deposited on nonpiezoelectric substrates), and YBCO single crystals. A “bridge” technique is employed in which piezoelectric substrates, patterned with interdigital transducers, are bonded to the sample under investigation. The temperature dependence of 168 MHz SAW attenuation in a single crystal near its superconducting transition has been measured in applied magnetic fields up to 1.6 T. Features are seen above the superconducting transition temperature which may be indicative of a transition in the electric polarization of the material. A field-dependent attenuation peak, seen in the superconducting state, is discussed in terms of the theory of thermally activated vortex motion. © 1997 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:70 ,  Issue: 11 )

Date of Publication:

Mar 1997

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