Abstract
The resistance of several granular NbN films has been measured as a function of temperature as they approach the superconducting state. The lowest-resistance data deviate from earlier reported power-law behavior above a phase-ordering transition , but are consistent with the exponential expression describing the resistance above a two-dimensional phase-transition temperature, , of the type proposed by Kosterlitz and Thouless. At a finite supercurrent appears.
- Received 13 April 1981
DOI:https://doi.org/10.1103/PhysRevLett.47.1071
©1981 American Physical Society