Evidence for a Surface-Phonon Contribution to Thin-Film Superconductivity: Depression of Tc by Noble-Gas Overlayers
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When care is taken to prevent contamination, the superconducting transition temperatures of thin Al, Sn, Tl, and amorphous-Bi films are depressed by overlayers of Ne or Ar. For a given film, the ratio of the shift in Tc produced by Ar to that produced by Ne is observed to be 1.8. The results can be explained in terms of a modification of the phonon spectrum by the presence of the noble gas. A simple model predicts the observed ratio of the effect of Ar to that of Ne and the relative magnitudes of the shifts for the four different metals. 1973 The American Physical Society.
author list (cited authors)
Naugle, D. G., Baker, J. W., & Allen, R. E.
complete list of authors
Naugle, DG||Baker, JW||Allen, RE