Influence of magnetism on superconductivity in epitaxial Fe/Nb bilayer systems

Th. Mühge; K. Theis-Bröhl; K. Westerholt; H. Zabel; N. N. Garif’yanov; Yu. V. Goryunov; I. A. Garifullin; G. G. Khaliullin

doi:10.1103/PhysRevB.57.5071

Influence of magnetism on superconductivity in epitaxial Fe/Nb bilayer systems

Th. Mühge, K. Theis-Bröhl, K. Westerholt, H. Zabel, N. N. Garif’yanov, Yu. V. Goryunov, I. A. Garifullin, G. G. Khaliullin

DOI 10.1103/PhysRevB.57.5071 · Physical Review B

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Abstract

We studied the superconductivity of molecular-beam-epitaxy-grown epitaxial Nb(110) thin films covered by Fe(110) monocrystalline layers with thicknesses dFe between 4 and 30 Å. We find a nonmonotonous dependence of the superconducting transition temperature Tc on dFe, however, without a maximum in Tc(dFe) as observed earlier in Nb/Fe layers prepared by sputtering techniques. We argue that the change in the Tc(dFe) curve is caused by a smaller thickness of the nonmagnetic Fe-rich interlayer at the Nb/Fe interface and can be explained within the same model developed previously for the explanation of the maximum in Tc(dFe) in sputtered Nb/Fe layers.

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.	8.5	Pressure not reported	midpoint