The use of BaF sub 2 buffer layers for the sputter-deposition of TlCaBaCuO thin-film superconductors
Thin films of the Tl-based superconductors often have relatively poor properties because of film/substrate interdiffusion which occurs during the anneal. We have therefore investigated the use of BaF{sub 2} as a diffusion barrier. TlCaBaCuO thin films were deposited by dc magnetron sputtering onto MgO <100> substrates, both with and without an evaporation-deposited BaF{sub 2} buffer layer, and post-annealed in a Tl over-pressure. Electrical properties of the films were determined by four-point probe analysis, and compositions were measured by ion-backscattering spectroscopy. Structural analysis was performed by x-ray diffraction and scanning electron microscopy. The BaF{sub 2} buffer layers were found to significantly improve the properties of the TlCaBaCuO thin films. 8 refs., 3 figs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- DOE/MA
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5212457
- Report Number(s):
- LA-UR-89-4205; CONF-891119-50; ON: DE90004859
- Resource Relation:
- Conference: Materials Research Society fall meeting, Boston, MA (USA), 27 Nov - 2 Dec 1989
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM FLUORIDES
DIFFUSION BARRIERS
BARIUM OXIDES
ELECTRICAL PROPERTIES
CALCIUM OXIDES
COPPER OXIDES
THALLIUM OXIDES
DEPOSITION
MAGNESIUM OXIDES
SUBSTRATES
SUPERCONDUCTING FILMS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
FILMS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
MAGNESIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
THALLIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity