New Insight into Enhanced Superconductivity in Metals near the Metal-Insulator Transition
- 17 October 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 87 (19) , 197004
- https://doi.org/10.1103/physrevlett.87.197004
Abstract
We have studied the transport properties of disordered WSi films near the metal/insulator transition (MIT) and we have also reviewed the data for several other disordered materials near their MIT. In all cases, we found the presence of enhanced superconductivity. We constructed a superconductivity “phase diagram” (i.e., versus ) for each system, which reveals a striking correlation: In all cases, values are significantly enhanced only for samples whose conductivities lie within a narrow range on the metallic side of, and moderately near, the MIT. We present a heuristic model to explain this phenomenon.
Keywords
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