Nonlocal transport in normal-metal/superconductor hybrid structures: Role of interference and interaction

J. Brauer; F. Hübler; M. Smetanin; D. Beckmann; H. v. Löhneysen

doi:10.1103/PhysRevB.81.024515

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Nonlocal transport in normal-metal/superconductor hybrid structures: Role of interference and interaction

J. Brauer, F. Hübler, M. Smetanin, D. Beckmann, H. v. Löhneysen

DOI 10.1103/PhysRevB.81.024515 · Physical Review B

T1

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Abstract

We have measured local and nonlocal conductance of mesoscopic normal-metal/superconductor hybrid structures fabricated by e-beam lithography and shadow evaporation. The sample geometry consists of a superconducting aluminum bar with two normal-metal wires forming tunnel contacts to the aluminum at distances of the order of the superconducting coherence length. We observe subgap anomalies in both local and nonlocal conductance that quickly decay with magnetic field and temperature. For the nonlocal conductance both positive and negative signs are found as a function of bias conditions, indicating at a competition of crossed Andreev reflection and elastic cotunneling. Our data suggest that the signals are caused by a phase-coherent enhancement of transport rather than dynamical Coulomb blockade.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.35	Pressure not reported	onset