Global phase coherence and dissipation in ultra-thin superconducting films

A threshold for the onset of global phase coherence, or zero resistance, has been revealed by systematic studies of the superconductivity of ultra-thin gallium and lead films. This threshold appears to be controlled by the normal state sheet resistance of the films which is the only relevant variabl...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1988-08, Vol.152 (1), p.218-222
Main Authors: Jaeger, H.M., Haviland, D.B., Goldman, A.M.
Format: Article
Language:English
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Summary:A threshold for the onset of global phase coherence, or zero resistance, has been revealed by systematic studies of the superconductivity of ultra-thin gallium and lead films. This threshold appears to be controlled by the normal state sheet resistance of the films which is the only relevant variable. The threshold value of 6.5 kΩ□ agrees with previous observations on ultra-thin tin films and further supports the notion of a universal resistance threshold. This value also is in agreement with the predictions of recent theoretical models which indicate the importance of zero-point fluctuations coupled to dissipation in such film systems.
ISSN:0921-4526
1873-2135
DOI:10.1016/0921-4526(88)90091-9