Transition from the tunneling regime to point contact and proximity-induced Josephson effect in lead–normal-metal nanojunctions

N. Agraït; J. G. Rodrigo; S. Vieira

doi:10.1103/PhysRevB.46.5814

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Transition from the tunneling regime to point contact and proximity-induced Josephson effect in lead–normal-metal nanojunctions

N. Agraït, J. G. Rodrigo, S. Vieira

DOI 10.1103/PhysRevB.46.5814 · Physical Review B

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Abstract

We have studied the transition from the tunneling regime to point contact with a low-temperature scanning tunneling microscope, when one of the electrodes is a normal metal (Au, Pt-Rh) and the other is a superconductor (Pb). Continuous variation of the junction resistance, spanning more than six orders of magnitude, results in the observation of the superconducting gap, Andreev reflection, and, for low resistance, a zero-bias sharp peak. Detailed study of the conductance curves and comparison with results for junctions composed of two superconducting electrodes support the interpretation of this feature as a second-order proximity-induced Josephson effect (PJE).

Source-reported materials — not catalogue approval

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