High critical current densities in YBa sub 2 Cu sub 3 O sub 7 minus x thin films formed by metalorganic chemical vapor deposition at 730 degree C

Journal Article · Mon Feb 11 00:00:00 EST 1991 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.104557· OSTI ID:5876940

Li, Y Q; Zhao, J; Chern, C S; Huang, W; Kulesha, G A; Lu, P; Gallois, B; Norris, P; Kear, B; Cosandey, F ^[1]

---

1. EMCORE Corporation, 35 Elizabeth Avenue, Somerset, New Jersey 08873 (US)

YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} superconducting thin films with a critical current density of 2.3{times}10{sup 6} A/cm{sup 2} at 77.7 K and 0 T were prepared by a metalorganic chemical vapor deposition process. The films were formed {ital in} {ital situ} on LaAlO{sub 3} at a substrate temperature of 730 {degree}C in 2 Torr partial pressure of N{sub 2}O. Resistivity and magnetic susceptibility measurements of the as-deposited films show a sharp superconducting transition temperature of 89 K with a narrow width of less than 1 K. Critical current densities were measured by the dc transport method with a patterned bridge of 120 {mu}m{times}40 {mu}m. Both x-ray diffraction and high-resolution electron microscopy measurements indicate that films grew epitaxially with the {ital c} axis perpendicular to the surface of the substrate.

• OSTI ID: 5876940
• Journal Information: Applied Physics Letters; (USA), Vol. 58:6; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CRITICAL CURRENT
COPPER OXIDES
YTTRIUM OXIDES
CHEMICAL VAPOR DEPOSITION
HIGH-TC SUPERCONDUCTORS
MAGNETIC SUSCEPTIBILITY
SUPERCONDUCTING FILMS
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL COATING
COPPER COMPOUNDS
CURRENTS
DEPOSITION
ELECTRIC CURRENTS
FILMS
MAGNETIC PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
SURFACE COATING
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties