In situ deposition of superconducting Bi-Pb-Sr-Ca-Cu-O thin films on MgO(100) substrates by rf magnetron sputtering and laser ablation
- Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA (USA)
Superconducting thin films of Bi-Pb-Sr-Ca-Cu-O (BPSCCO) have been prepared {ital in} {ital situ} by magnetron sputtering and laser ablation onto heated MgO (100) substrates. Post-deposition annealing at higher temperatures was not required to obtain superconducting BPSCCO films, and a narrow temperature window in a very similar temperature region was observed for the growth of oriented films for both the laser ablation and magnetron sputtering technique. The best films were smooth and shiny with their {ital c} axes oriented perpendicular to the substrate surface but scanning electron microscope analysis showed particulates on the film surface. Room-temperature resistivity values of the order of 2--3 m{Omega} cm were obtained for these films. At 70 K and 8 T, the resistivity ratio for the {ital H}{perpendicular} and {parallel} to the plane of the film was {approximately}25 for an applied current density {ital J} of 0.8 A/cm{sup 2}. Rutherford backscattering analysis on the laser-ablated and sputtered films indicates that the BPSCCO films had 2223 composition while the x-ray diffraction studies indicated mixed 2212 and 2223 phases.
- OSTI ID:
- 6002154
- Journal Information:
- Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 57:23; ISSN APPLA; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Cermets
& Refractories-- Preparation & Fabrication
ABLATION
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
FILMS
HIGH-TC SUPERCONDUCTORS
LEAD COMPOUNDS
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MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SPUTTERING
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SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
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