Threshold for superconductivity in ultrathin amorphous gallium films

作者：Heinrich M. Jaeger, D. B. Haviland, Allen M. Goldman, B. G. Orr · 发表于：Physical review. B, Condensed matter · 年份：1986 · DOI：10.1103/physrevb.34.4920 · 被引用次数：221 · 研究领域：Physics of Superconductivity and Magnetism、Quantum and electron transport phenomena、Surface and Thin Film Phenomena

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 \ensuremath{\Omega}/\ensuremath{\square}. This result agrees with previous observations on crystalline Sn films and further supports the notion of a universal resistance threshold.