Data di Pubblicazione:
1993
Abstract:
A ring microstrip resonator technique has been set up to measure the surface impedance of superconducting films in the range 1-20 GHz as a function of temperature and both DC and RF field amplitude. The method has been tested on Nb films and extended to both metallic compounds of interest for thin-film-coated accelerating cavity applications (NbTiN) and high T/sub c/ oxide superconducting films of potential interest for microwave circuit applications such as high-quality YBCO and BSCCO compounds, including, in the latter compound, samples obtained by liquid phase epitaxy. The results confirm that losses at the grain boundaries or twinning planes play an important role in determining the residual term and the high magnetic field degradation of the surface resistance in both metallic and high-T/sub c/ superconducting films.
Tipologia CRIS:
01.01 Articolo in rivista
Keywords:
1 to 20 GHz; BiSrCaCuO; Circuit testing; DC field; Electrical resistance measurement; Impedance measurement; Magnetic field measurement; Microstrip resonators; Nb films; NbTiN; RF field amplitude; Radio frequency; Superconducting films; Surface impedance; Surface resistance; Temperature distribution; YBaCuO; barium compounds; bismuth compounds; calcium compounds; electric resistance measurement; grain boundaries; high T/sub c/ oxide superconducting films; high magnetic field degradation; high-temperature superconductors; liquid phase epitaxy; losses; metallic compounds; microstrip ring resonator technique; microwave circuit applications; microwave measurement; niobium; niobium compounds; strontium compounds; surface conductivity; thin-film-coated accelerating cavity applications; titanium compounds; twinning planes; yttrium compounds
Elenco autori:
Montuori, Marco
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