Insulator-Superconductor Transition in 3D Granular Al-Ge Films
A. Gerber, A. Milner, G. Deutscher, M. Karpovsky, A. Gladkikh
DOI 10.1103/PhysRevLett.78.4277 · Physical Review Letters
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Abstract
We report the results of high magnetic field study of granular 3D Al-Ge and demonstrate that intragranular superconductivity leads in truly insulating samples (with an exponentially diverging normal state resistivity), either to a global superconducting phase coherent state, or to a “superconductor-insulator” state with Cooper pairs totally localized within individual grains, depending on the strength of the intergranular Josephson coupling.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al-Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.8 | Pressure not reported | onset |
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