title: New insight into enhanced superconductivity in metals near the metal-insulator transition.
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., T(c) versus sigma) for each system, which reveals a striking correlation: In all cases, T(c) 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.
authors.affiliation: Naval Research Laboratory, Washington, DC 20375, USA.
authors.forename: M S
authors.initials: MS
authors.lastname: Osofsky
authors.forename: R J
authors.initials: RJ
authors.lastname: Soulen
authors.forename: J H
authors.initials: JH
authors.lastname: Claassen
authors.forename: G
authors.initials: G
authors.lastname: Trotter
authors.forename: H
authors.initials: H
authors.lastname: Kim
authors.forename: J S
authors.initials: JS
authors.lastname: Horwitz