Terahertz transmission of NbN superconductor thin film

0348301 - FZÚ 2011 RIV NL eng J - Článek v odborném periodiku
Tesař, Roman - Koláček, Jan - Šimša, Zdeněk - Šindler, Michal - Skrbek, L. - Il'in, K. - Sieger, M.
Terahertz transmission of NbN superconductor thin film.
Physica. C. Roč. 470, č. 19 (2010), s. 932-934. ISSN 0921-4534. E-ISSN 1873-2143
Grant CEP: GA ČR GA202/08/0326
Výzkumný záměr: CEZ:AV0Z10100521
Klíčová slova: far-infrared transmission * NbN * superconducting film * magnetic vortices * terahertz waves
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.407, rok: 2010

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
Trvalý link: http://hdl.handle.net/11104/0188866