Prediction of superconducting transition temperatures of heterostructures based on the quasiparticle spectrum

Csire, Gábor and Cserti, József and Tüttő, István and Ujfalussy, Balázs (2016) Prediction of superconducting transition temperatures of heterostructures based on the quasiparticle spectrum. PHYSICAL REVIEW B, 94 (10). ISSN 2469-9950

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Abstract

In this paper we present material specific calculations of superconductor – normal metal het- erostructures using density functional theory. In particular, we calculate the quasiparticle spectrum of different normal metal overlayers on a Nb(100) host. We find that the Andreev reflection leads to the formation of momentum dependent quasiparticle bands in the normal metal. As a consequence, the spectrum has a strongly momentum dependent induced gap. From the thickness dependence of the gap size we calculate the superconducting critical temperature of Au/Nb(100) heterostructures where we find very good agreement with experiments. Moreover, predictions are made for similar heterostructures of other compounds.

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