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Anomalous proximity effect in an inhomogeneous disordered superconductor
W Escoffier1, C Chapelier, N Hadacek
1CEA-DSM-DRFMC-SPSMS, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France.
Physical Review Letters
|December 17, 2004
Summary
Researchers observed a nonuniform superconducting and normal state in a TiN film using low-temperature microscopy. Mesoscopic fluctuations may drive this superconductor-normal-metal quantum transition, differing from typical proximity effects.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Superconductor-normal interfaces are crucial for understanding quantum phenomena.
- Proximity effects typically describe the interplay between superconducting and normal regions.
Purpose of the Study:
- To investigate the spatial electronic state of a TiN film at very low temperatures.
- To explore deviations from conventional proximity effects in superconductor-normal systems.
Main Methods:
- Utilized very low temperature scanning tunneling microscopy (STM).
- Employed scanning tunneling spectroscopy (STS) to probe local electronic properties.
Main Results:
- Observed a nonuniform state with distinct superconducting (S) and normal (N) areas within the TiN film.
- The local density of states showed a spatial dependence between S and N regions, differing from standard proximity effects.
Conclusions:
- Mesoscopic fluctuations are proposed as a significant factor in the observed phenomena.
- The findings align with recent theories on superconductor-normal-metal quantum transitions.