In situ growth and flux pinning in Ag-doped YBa sub 2 Cu sub 3 O sub 7 minus y thin films
- Department of Physics, National Taiwan University, Taipei, Taiwan (TW)
- Department of Physics, National Taiwan Normal University, Taipei, (Taiwan)
We have grown {ital in} {ital situ} Ag-doped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} thin films by high-pressure magnetron sputtering using a stoichiometric target. The sputtering was carried out in a mixture of Ar (70%) and O{sub 2} (30%) at a pressure of 200 mTorr, with the substrate temperature kept at about 700 {degree}C during sputtering. We made a relatively high-pressure oxygen environment by employing an oxygen jet near the substrates. After deposition one atmosphere of O{sub 2} was introduced into the chamber, and the sample was cooled down to room temperature slowly (5 {degree}C/min). This method gives highly reproducible superconducting films with {ital T}{sub {ital c}} (50%) at 83--88 K and zero resistance at 78--87 K depending on the growth conditions and the substrates used. In magnetic fields there is a narrowing of the resistive transition width for Y-Ba-Cu-O films with Ag impurities. We attribute the narrowing to the enhanced flux pinning due to the Ag impurities.
- OSTI ID:
- 5622232
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:10; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL GROWTH
ELECTRON TUBES
ELECTRONIC EQUIPMENT
EQUIPMENT
FILMS
MAGNETIC FLUX
MAGNETRONS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SILVER ADDITIONS
SILVER ALLOYS
SPUTTERING
SUPERCONDUCTING FILMS
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES