Phys. Rev. Lett. 88, 186403 (2002) [4 pages]Inverse Proximity Effect in a Strongly Correlated Electron SystemReceived 13 April 2001; published 23 April 2002 An anomalous superconducting proximity effect between a strongly correlated electron system and a normal metal is demonstrated. The model system is a 2D ultrathin superconducting quench-condensed Pb film. Such a highly disordered film has a reduced transition temperature (Tc = 1.7K) due to the strong e--e- interaction. Instead of weakening the superconductivity, an overlayer of Ag on Pb induces an increase of both the Tc and the gap. The restoration of the electron screening brought about by the quasiparticles from the normal metal can explain this striking inverse proximity effect. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.186403
DOI:
10.1103/PhysRevLett.88.186403
PACS:
71.27.+a, 71.30.+h, 73.20.At, 74.50.+r
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