Infrared vortex-state electrodynamics in type-II superconducting thin films

Xiaoxiang Xi; J.-H. Park; D. Graf; G. L. Carr; D. B. Tanner

doi:10.1103/PhysRevB.87.184503

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Infrared vortex-state electrodynamics in type-II superconducting thin films

Xiaoxiang Xi, J.-H. Park, D. Graf, G. L. Carr, D. B. Tanner

DOI 10.1103/PhysRevB.87.184503 · Physical Review B

T1

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Abstract

The vortex-state electrodynamics of s-wave superconductors has been studied by infrared spectroscopy. Far-infrared transmission and reflection spectra of superconducting Nb0.5Ti0.5N and NbN thin films were measured in a magnetic field perpendicular to the film surface, and the optical conductivity was extracted. The data show clear reduction of superconducting signature. We consider the vortex state as a two-component effective medium of normal cores embedded in a BCS superconductor. The spectral features are well explained by the Maxwell Garnett theory. Our analysis supports the presence of magnetic-field-induced pair-breaking effects in the superconducting component outside of the vortex cores.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb0.5Ti0.5N Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown