2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28175Interference of proximity induced superconducting correlations in mesoscopic metallic rings is sensitive to the magnetic flux $Φ$ inside these rings. This is the reason for magnetoconductance oscillations in such systems. We detected experimentally and explained theoretically a novel effect: the phase of these oscillations can switch between 0 and $π$ depending on the resistance of intermetallic interfaces and temperature. The effect is due to a nontrivial interplay between the proximity induced enhancement of the local conductivity and the proximity induced suppression of the density of states at low energies.4 Pages, 5 postscript figures. Submitted to Phys. Rev. LettSuperconductivityMesoscale and Nanoscale Physicstext