WEAK-LOCALIZATION IN METALLIC WIRE SYSTEMS IN CONTACT WITH A SUPERCONDUCTOR

A simple method is outlined for the calculation of the weak-localizati on correction to resistance for metallic wire systems in contact with a superconductor. To illustrate the approach, calculations of the resi stance correction are carried out for simple systems. We found that th e weak-localization correction for a normal-metal wire is enhanced whe n an end of the wire is connected to a superconductor instead of a nor mal-metal probe. A similar enhancement is also seen in a normal-metal ring in contact with a superconductor. Resistance oscillations with un usual period hc/4e are discussed for a doubly-connected structure cont aining a superconducting segment.