Threshold for superconductivity in ultrathin amorphous gallium films

H. M. Jaeger; D. B. Haviland; A. M. Goldman; B. G. Orr

doi:10.1103/PhysRevB.34.4920

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Threshold for superconductivity in ultrathin amorphous gallium films

H. M. Jaeger, D. B. Haviland, A. M. Goldman, B. G. Orr

DOI 10.1103/PhysRevB.34.4920 · Physical Review B

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Abstract

Systematic studies of the onset of superconductivity in ultrathin amorphous Ga films have revealed the existence of a threshold dependent only on the normal-state sheet resistance. Global superconductivity, or zero resistance, develops only when the normal-state sheet resistance falls below 6000 Ω/□. This result agrees with previous observations on crystalline Sn films and further supports the notion of a universal resistance threshold.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ga Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.4	Pressure not reported	midpoint
Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown