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VOLUME 58 (1993) | ISSUE 1 | PAGE 48
Anomalous proximity effect in mesoscopic conductors
It has been observed experimentally that a normal mesoscopic conductor coupled by a normal bridge to a superconductor with small dimensions can undergo a transition to states with either elevated or depressed conductivity if the bridge is considerably longer than the coherence length of the normal metal. The changes in the conductance are AG = ±2χ 103 (e2/h).