Quantum Size Effects on Andreev Transport in Nb/Au/Nb Josephson Junctions: A Combined Ab Initio and Experimental Study

Hiroki Yamazaki; Gábor Csire; Nóra Kucska; Nic Shannon; Balázs Győrffy; Hidenori Takagi; Balázs Újfalussy

doi:10.1103/PhysRevLett.134.196002

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Quantum Size Effects on Andreev Transport in Nb/Au/Nb Josephson Junctions: A Combined Ab Initio and Experimental Study

Hiroki Yamazaki, Gábor Csire, Nóra Kucska, Nic Shannon, Balázs Győrffy, Hidenori Takagi, Balázs Újfalussy

DOI 10.1103/PhysRevLett.134.196002 · Physical Review Letters

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Abstract

We have measured the critical current density, superconducting coherence length, and superconducting transition temperature of single-domain, epitaxially grown Nb(110)/Au(111)/Nb(110) trilayers, all of which show a nonmonotonic dependence on the thickness of the Au layer. These results are compared with the predictions of a relativistic, ab initio theory, which incorporates superconducting correlations. We find good agreement with experiment, coming from a rich interplay between superconducting proximity and quantum size effects, mediated by Andreev bound states. These results suggest that quantum size effects could provide a systematic method of controlling the transport properties of superconducting multilayers.

Source-reported materials — not catalogue approval

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