Abstract
We present the first preliminary results on proximity coupling of surface acoustic waves (SAW) to a superconducting Al <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</inf> O <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-x</inf> film. The aluminum film was evaporated onto a glass substrate in a partial pressure of oxygen. The glass was then placed, with the film face down, between a pair of SAW transducers on a piezoelectric LiNbO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> substrate. Mechanical coupling between film and SAW was very weak and any attenuation of the SAW by electron-phonon interaction could be neglected. The SAW was attenuated by the coupling to the film of the piezoelectric field that the SAW produced. We found a large decrease in attenuation when superconductivity starts to appear in the film.
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