Infrared Vortex-State Electrodynamics in Type-II Superconducting Thin Films

Abstract

The vortex-state electrodynamics of s-wave superconductors has been studied by infrared spectroscopy. Far-infrared transmission and reflection spectra of superconducting NbTiN 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.

References in corpus (3)

• Microwave response of vortices in superconducting thin films of Re and Al
• Microwave response of thin niobium films under perpendicular static magnetic fields
• Effect of a magnetic field on the quasiparticle recombination in superconductors

Cited by in corpus (6)

• Nodeless bulk superconductivity in the time-reversal symmetry breaking Bi/Ni bilayer system
• Far-infrared electrodynamics of thin superconducting NbN film in magnetic field
• Two-band conductivity of a FeSe${}_{0.5}$Te${}_{0.5}$ film by reflectance measurements in the terahertz and infrared range
• Electrodynamics of superconducting pnictide superlattices
• Anomalously small superconducting gap in the strong spin-orbit coupled superconductor: $\beta -$Tungsten
• Onset of superconductor-insulator transition in an ultrathin NbN film under in-plane magnetic field studied by terahertz spectroscopy