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Two-dimensional phase transition in granular NbN films

Journal Article · · Phys. Rev. Lett.; (United States)
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 T/sub c/j, but are consistent with the exponential expression describing the resistance above a two-dimensional phase-transition temperature, T/sub 2D/, of the type proposed by Kosterlitz and Thouless. At T/sub 2D/ a finite supercurrent appears.
Research Organization:
Naval Research Laboratory, Washington, D. C. 20375
OSTI ID:
5976938
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 47:15; ISSN PRLTA
Country of Publication:
United States
Language:
English