X-ray-absorption fine-structure studies of superconducting Tl sub 2 CaBa sub 2 Cu sub 2 O sub x thin films

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.294· OSTI ID:6534526

DiMarzio, D; Wiesmann, H; Chen, D H; Heald, S M ^[1]

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1. Department of Applied Science, Brookhaven National Laboratory, Upton, NY (USA)

Superconducting Tl-Ca-Ba-Cu-O thin films have been prepared by the technique of reactive magnetron sputtering using targets of Tl, Ca-Ba, and Cu. Three films with different quality superconducting transitions were fabricated and analyzed. X-ray-absorption fine-structure measurements were performed on the Cu {ital K} edge in order to determine orientation, bond lengths, number of nearest neighbors, and relative disorder as a function of the quality of their superconducting transition. Magnetically oriented powder samples of the appropriate superconducting phase were used for comparison. X-ray-absorption near-edge results reveal increasing CuO{sub 2} plane orientation parallel to the substrate as the quality of the superconducting transition improved, consistent with x-ray-diffraction data. Extended x-ray-absorption fine-structure (EXAFS) measurements also show this trend. EXAFS gives a Cu-O(1) bond length of 1.92{plus minus}0.01 A for all three films, and all three samples exhibit an increasing Debye-Waller disorder factor consistent with the deterioration in the quality of their superconducting transitions.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6534526
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 42:1; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
TRANSITION TEMPERATURE
X-RAY SPECTRA
CALCIUM OXIDES
COPPER OXIDES
THALLIUM OXIDES
ABSORPTION SPECTRA
BOND LENGTHS
CRYSTAL STRUCTURE
DEBYE-WALLER FACTOR
FINE STRUCTURE
ORDER-DISORDER TRANSFORMATIONS
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
LENGTH
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SPECTRA
THALLIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties