Title :
Defects in YBCO relevant for RF superconductivity: T-, f- and H-dependencies
Author :
Keskin, E. ; Numssen, K. ; Halbritter, J.
Author_Institution :
Inst. fur Materialforschung I, Forschungszentrum Karlsruhe, Germany
fDate :
6/1/1999 12:00:00 AM
Abstract :
The present understanding of intrinsic and extrinsic HTS properties gained in the last years is applied to sintered and epitaxially grown YBCO. As results, the mean free path l increases rapidly below T/sub c/, whereas the weak links with critical Josephson current j/sub CJ/(T) and leakage current resistance R/sub bl/ describe R(T<0.8 T/sub c/, f, H) /spl cong/R/sub res/(T, f, H) over seven orders of magnitude in j/sub CJ/ with j/sub CJ/R/sub bl//sup 2//spl cong/10/sup -12/ A/spl Omega//sup 2/ cm/sup 2/.
Keywords :
Josephson effect; barium compounds; critical currents; crystal defects; high-frequency effects; high-temperature superconductors; leakage currents; yttrium compounds; RF superconductivity; YBaCuO; critical Josephson current; defects; extrinsic HTS properties; frequency dependence; intrinsic HTS properties; leakage current resistance; magnetic field dependence; mean free path; sintered epitaxially grown samples; temperature dependence; weak links; Crystalline materials; Granular superconductors; Josephson junctions; Leakage current; Niobium; Oxidation; Radio frequency; Superconducting materials; Superconductivity; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
