Surface resistance of superconducting films by a microstrip ring resonator technique

Author

Andreone, A. ; DiChiara, A. ; Peluso, G. ; di Uccio, U.S. ; Attanasio, C. ; Maritato, L. ; Marra, S. ; Vaglio, R. ; Milani, E. ; Montuori, M.

Author_Institution

Dipartimento di Scienze Fisiche, Napoli Federico II Univ., Italy

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1453

Lastpage

1456

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.<>

Keywords

barium compounds; bismuth compounds; calcium compounds; electric resistance measurement; high-temperature superconductors; microwave measurement; niobium; niobium compounds; strontium compounds; surface conductivity; titanium compounds; yttrium compounds; 1 to 20 GHz; BiSrCaCuO; DC field; Nb films; NbTiN; RF field amplitude; YBaCuO; grain boundaries; high T/sub c/ oxide superconducting films; high magnetic field degradation; liquid phase epitaxy; losses; metallic compounds; microstrip ring resonator technique; microwave circuit applications; superconducting films; surface impedance; surface resistance; thin-film-coated accelerating cavity applications; twinning planes; Circuit testing; Electrical resistance measurement; Impedance measurement; Magnetic field measurement; Microstrip resonators; Radio frequency; Superconducting films; Surface impedance; Surface resistance; Temperature distribution;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233622

Filename

233622