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Paper
Threshold for superconductivity in ultrathin amorphous gallium films
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 /-. This result agrees with previous observations on crystalline Sn films and further supports the notion of a universal resistance threshold. © 1986 The American Physical Society.