In situ deposition of superconducting YBa sub 2 Cu sub 3 O sub 7 minus sub x and DyBa sub 2 Cu sub 3 O sub 7 minus sub x thin films by organometallic molecular-beam epitaxy

Journal Article · Sun Dec 01 23:00:00 EST 1991 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.105788· OSTI ID:6257768

King, L L.H.; Hsieh, K Y; Lichtenwalner, D J; Kingon, A I ^[1]

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1. Department of Material Science Engineering, North Carolina State University, Raleigh, North Carolina (USA)

Smooth, {ital c}-axis oriented, superconducting thin films of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} and DyBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} have been grown on (100) MgO by organometallic molecular-beam epitaxy. To our knowledge this is the first report of this technique for the fabrication of this class of high {ital T}{sub {ital c}} superconductors. Y (or Dy) {beta}-diketonate organometallic sources are utilized with Ba and Cu metallic sources. Films are grown {ital in} {ital situ} by codepositing from these sources in an ozone ambient with a substrate temperature of 700 {degree}C. The use of an active oxygen source (ozone) is required for decomposition of the organometallic sources as well as for the attainment of superconducting films {ital in} {ital situ}. The films are characterized by {ital T}{sub {ital c}}'s as high as 85 K and {ital J}{sub {ital c}}'s of 1.2{times}10{sup 6} A/cm{sup 2} at 12 K and 2.4{times}10{sup 3} A/cm{sup 2} at 77 K. In addition to the four point {ital T}{sub {ital c}} and {ital J}{sub {ital c}} results, alternating-current susceptibility measurements are also reported. The composition of the films has been determined by Rutherford backscattering spectroscopy, Auger and secondary ion mass spectroscopy analysis, with the smoothness of the films characterized by scanning tunneling microscopy.

• OSTI ID: 6257768
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 59:23; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALINE EARTH METAL COMPOUNDS
AUGER ELECTRON SPECTROSCOPY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
CUPRATES
DYSPROSIUM COMPOUNDS
DYSPROSIUM OXIDES
ELECTRON SPECTROSCOPY
EPITAXY
FILMS
HIGH-TC SUPERCONDUCTORS
IN-SITU PROCESSING
MOLECULAR BEAM EPITAXY
OXIDES
OXYGEN COMPOUNDS
PROCESSING
RARE EARTH COMPOUNDS
SPECTROSCOPY
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES