Enhancement of the superconducting properties of TlBa{sub 2}CaCu{sub 2}O{sub 7+{delta}} thin films via postannealing

Journal Article · Mon Dec 25 04:00:00 EST 1995 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.114420· OSTI ID:147755

Siegal, M P; Venturini, E L; Newcomer, P P; Morosin, B; Overmyer, D L; Dominguez, F; Dunn, R ^[1]

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1. Sandia National Laboratories, Albuquerque, New Mexico 87185-1421 (United States)

The superconducting properties of TlBa{sub 2}CaCu{sub 2}O{sub 7+{delta}}(Tl-1212) films are greatly enhanced by annealing in unreactive ambients such as nitrogen at temperatures ranging from {ital T}{sub {ital a}}=250--600 {degree}C. The transition temperature, {ital T}{sub {ital c}}, of these Tl-1212 films as-grown in oxygen is 70 K. Annealing for 1 h at 250 {degree}C elevates {ital T}{sub {ital c}} above 90 K. {ital T}{sub {ital c}} further increases and sharpens for {ital T}{sub {ital a}}=600 {degree}C. In addition, subtle changes occur in the microstructure correlating with improved critical current density. These results indicate that Tl-1212 films may be of greater relevance for electronics applications than previously believed. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• Research Organization: Sandia National Laboratory
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 147755
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 26 Vol. 67; ISSN 0003-6951; ISSN APPLAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
BARIUM OXIDES
CALCIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
HIGH-TC SUPERCONDUCTORS
MICROSTRUCTURE
THALLIUM OXIDES
THIN FILMS
TRANSITION TEMPERATURE