Naslov
Microwave response of thin niobium films under perpendicular static magnetic fields

Autori
Janjušević, Dragan ; Grbić, Mihael Srđan ; Požek, Miroslav ; Dulčić, Antonije ; Paar, Dalibor ; Nebendahl, Bernd ; Wagner, Thomas

Izvornik
Physical review. B, Condensed matter and materials physics (1098-0121) 74 (2006), 10; 104501-104507

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Nb thin films ; upper critical fields ; microwave response

Sažetak
The microwave response of high quality niobium films in a perpendicular static magnetic field has been investigated. The complex frequency shift was measured up to the upper critical fields. The data have been analyzed by the effective conductivity model for the type-II superconductors in the mixed state. Thin niobium films can serve as model system for the upper critical field determination of high-$\kappa$ superconducting samples from microwave measurements. The depinning frequency of the thinnest (10\:nm) film is $\approx 20\:\rm{; ; ; ; ; ; ; GHz}; ; ; ; ; ; ; $ due to the surface pinning centers. For samples with high values of depinning frequency, one should measure both components of the complex frequency shift in order to determine the flow resistivity.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Cond-mat/0602168

POVEZANOST RADA