Terahertz transmission of NbN superconductor thin film

Transmission of terahertz waves through a thin layer of the NbN superconductor deposited on a sapphire substrate was studied as a function of temperature in zero field as well as in magnetic field perpendicular to the sample. For photon energies lower than optical gap, detailed temperature measureme...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2010-10, Vol.470 (19), p.932-934
Main Authors: Tesař, R., Koláček, J., Šimša, Z., Šindler, M., Skrbek, L., Il’in, K., Siegel, M.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Deposition
Exact sciences and technology
Far-infrared transmission
Incident radiation
Low tc films
Magnetic fields
Magnetic vortices
NbN
Photons
Physics
Superconducting film
Superconducting films
Superconducting films and low-dimensional structures
Superconductivity
Superconductors
Terahertz waves
Thin films
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Summary:Transmission of terahertz waves through a thin layer of the NbN superconductor deposited on a sapphire substrate was studied as a function of temperature in zero field as well as in magnetic field perpendicular to the sample. For photon energies lower than optical gap, detailed temperature measurements in zero field provide BCS-like curves with a pronounced peak below the critical temperature. In accordance with the BCS model, the temperature peak disappears as the energy of incident radiation is increased above the gap. In non-zero field, the temperature behavior of transmission is modified because the gap is suppressed and vanishes at upper critical field. In addition, the presence of quantized vortices in the superconducting film substantially changes shape of the temperature curves.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2010.02.077