Title :
Microwave surface resistance of epitaxial YBa/sub 2/Cu/sub 3/O/sub 7-x/ films: studies on oxygen deficiency and disordering
Author :
Klein, N. ; Poppe, U. ; Tellmann, N. ; Schulz, H. ; Evers, W. ; Dahne, U. ; Urban, K.
Author_Institution :
Inst. fur Festkorperforschung, Forschungszentrum Julich GmbH, Germany
fDate :
3/1/1993 12:00:00 AM
Abstract :
The authors have studied the microwave surface resistance R/sub S/ at 19 GHz of epitaxial YBa/sub 2/Cu/sub 3/O/sub 7-x/ films prepared by high oxygen pressure DC-sputtering on NdGaO/sub 3/ and LaAlO/sub 3/ substrates. Oxygen deficiency x, O>
Keywords :
annealing; barium compounds; high-frequency effects; high-temperature superconductors; order-disorder transformations; sputtered coatings; stoichiometry; superconducting energy gap; superconducting epitaxial layers; superconducting thin films; superconducting transition temperature; surface conductivity; yttrium compounds; 19 GHz; 60 to 250 degC; CuO chains; LaAlO/sub 3/; NdGaO/sub 3/; YBa/sub 2/Cu/sub 3/O/sub 7- delta /; annealing; disordering; epitaxial YBa/sub 2/Cu/sub 3/O/sub 7-x/ films; exponential behavior; high oxygen pressure DC-sputtering; high temperature superconductors; intrinsic energy gap; microwave surface resistance; oxygen deficiency; oxygen-deficient film; oxygenated films; postannealing; Conductivity; Crystallization; Electromagnetic heating; Oxygen; Sputtering; Superconducting epitaxial layers; Superconducting microwave devices; Surface resistance; Temperature; X-ray diffraction;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
