Abstract
We present first experimental and theoretical results demonstrating a crossover from mesoscopic (phase-coherent transmission) to macroscopic (two resistors in series) behavior of conductance spectra for a normal-superconducting heterostructure. Following the lines of the Büttiker's approach to normal double-barrier devices, we show that phase-randomizing events in a mesoscopic interbarrier layer together with Andreev-reflection processes drastically influence corresponding conductance vs. voltage characteristics. An anomalous temperature shift of a gap-like feature in an Ag/LaBa 2Cu 3O 7− x point contact is interpreted as an effect of the partial phase decoherence in the intermediate magnetically active region between the normal-metal tip and the bulk 123-type superconducting cuprate.
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