Interpretation of transmission through type II superconducting thin film on dielectric substrate as observed by laser thermal spectroscopy

0385841 - FZÚ 2013 RIV NL eng J - Journal Article
Šindler, Michal - Tesař, Roman - Koláček, Jan - Skrbek, L.
Interpretation of transmission through type II superconducting thin film on dielectric substrate as observed by laser thermal spectroscopy.
Physica. C. Roč. 483, DEC (2012), s. 127-135. ISSN 0921-4534. E-ISSN 1873-2143
R&D Projects: GA ČR(CZ) GAP204/11/0015
Grant - others:European Science Foundation(XE) NES, 2007 - 2012
Institutional research plan: CEZ:AV0Z10100521
Keywords : far-infrared transmission * NbN * superconducting film * vortices * terahertz waves
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 0.718, year: 2012

We provide a thorough analysis of THz properties of BCS-like superconducting thin films. Temperature and frequency dependence of complex conductivity in zero magnetic field is discussed by utilizing the Zimmerman et al. explicit BCS based formula [Physica C 183 (1991) 99]. We extend this approach by employing the effective medium theory and develop a phenomenological model capable of accounting for the influence of external magnetic field. Using Yeh powerful formalism [Surface Sci. 96 (1980) 41] we calculate optical transmission of linearly polarized laser beam normally incident to a multilayered sample consisting of a thin NbN film grown on birefringent sapphire substrate, entirely covering ranges of interest in temperature and frequency. A proposal to exploit linear polarization of the incident beam parallel with principal axes of conductivity tensor is explained and theoretical predictions for a realistic NbN sample are computed and discussed.
Permanent Link: http://hdl.handle.net/11104/0007507