Abstract
We measured the dynamic resistance (dV/dI) of mesoscopic normal-metal/superconductor/normal-metal (N-S-N) junctions. At low temperatures (T<4 K), we observed dips indV/dI at zero bias and anomalous peaks near the bias of 2ΔPbln/e (where 2ΔPbln is the gap energy of superconducting Pb-In) and at higher biasVc The zero-bias dips are supposed to originate from Andreev reflections of electrons and the peaks near 2ΔPbln/e from the interference of quasiparticles inside S. We attribute the peaks atVc to the transition of the superconducting region to the normal state as the current exceeds the critical currentIc of S.
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