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Far-infrared electrodynamics of thin superconducting NbN film in magnetic fields
We studied a thin superconducting NbN film in magnetic fields up to 8 T above the zerotemperature limit by means of time-domain terahertz and scanning tunneling spectroscopies in order to understand the vortex response.Scanning tunneling spectroscopy was used to determine the optical gap and the upper critical field of the …