Far-infrared transmission of a superconducting NbN film

M. Šindler; R. Tesař; J. Koláček; L. Skrbek; Z. Šimša

doi:10.1103/PhysRevB.81.184529

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Far-infrared transmission of a superconducting NbN film

M. Šindler, R. Tesař, J. Koláček, L. Skrbek, Z. Šimša

DOI 10.1103/PhysRevB.81.184529 · Physical Review B

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Abstract

We report far-infrared optical properties of a thin NbN superconductor in magnetic field, B, up to 10 T. Transmission, Tr(T,B), of monochromatic linearly polarized laser beam with frequency below and above an optical gap is measured both below and above Tc. Tr(T,B=0) is well described by the BCS-based model that approximates the sample as a mixture of superconductors with different Tc. Tr(T,B≠0) appears qualitatively different for Voigt and Faraday geometry. To calculate optical properties, we use Bruggeman’s approach and present a phenomenological model accounting for both field orientations. The model captures all observed features of the Tr(T,B) data.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.8	Pressure not reported	onset