Pair-breaking model for disorder in two-dimensional superconductors

Measurements of the resistive transitions, critical fields, and magnetoconductance as a function of increasing normal-state sheet resistance R/sub N/ reveal the systematics of a pronounced change from superconducting to insulating behavior in thin In/InO/sub x/ composite films. With increasing R/sub N/, a rapid suppression of the transition temperature together with a decreasing critical-field slope parameter are observed. These results are modeled using a pair-breaking formalism in which the pair-breaking rate is found to be proportional to R/sub N/ and independent of temperature