Boundary effects in two-band superconductors

Andrea Benfenati; Albert Samoilenka; Egor Babaev

doi:10.1103/PhysRevB.103.144512

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Boundary effects in two-band superconductors

Andrea Benfenati, Albert Samoilenka, Egor Babaev

DOI 10.1103/PhysRevB.103.144512 · Physical Review B

T1

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Abstract

We present a microscopic study of the behavior of the order parameters near the boundaries of a two-band superconducting material, described by the standard tight-binding Bardeen-Cooper-Schrieffer model. We find superconducting surface states. The relative difference between bulk and surface critical temperatures is a nontrivial function of the interband coupling strength. For superconductors with weak interband coupling, boundaries induce variations of the gaps with the presence of multiple length scales, despite nonzero interband Josephson coupling.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
ZrB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown