Low-temperature formation of epitaxial Tl sub 2 Ca sub 2 Ba sub 2 Cu sub 3 O sub 10 thin films in reduced O sub 2 pressure

Journal Article · Mon Feb 10 00:00:00 EST 1992 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.106515· OSTI ID:7071115

Lee, W Y; Garrison, S M; Kawasaki, M; Venturini, E L; Ahn, B T; Boyers, R; Salem, J; Savoy, R; Vazquez, J ^[1]

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1. IBM Almaden Research Center, San Jose, California 95120 (United States) Sandia National Laboratories, P. O. Box 5800, Albuquerque, New Mexico 87185 (United States)

Epitaxial Tl{sub 2}Ca{sub 2}Ba{sub 2}Cu{sub 3}O{sub 10} films on (100) LaAlO{sub 3} are prepared by post-annealing 2Tl:2Ca:2Ba:3Cu precursor films at 830--860 {degree}C in {congruent}0.03--0.15 atm of O{sub 2}. These films (0.2--1.1 {mu}m thickness) are smooth and shiny to the eye, and have a sharp zero resistance and onset diamagnetic transition temperature of 117--121 K. Transport critical current densities of 1.6{times}10{sup 6} A/cm{sup 2} at 77 K and {congruent}10{sup 5} A/cm{sup 2} at 100 K are obtained for a 0.38-{mu}m-thick film in magnetic fields up to 100 Oe. Strong flux pinning at low temperatures is inferred from the weak-field dependence of the critical current density calculated from magnetic hysteresis loops. At 5 K, the best film has a magnetic critical current density of 9{times}10{sup 6} A/cm{sup 2} in zero field, decreasing gradually to 1.5{times}10{sup 6} A/cm{sup 2} in a 5-T field.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 7071115
• Journal Information: Applied Physics Letters; (United States), Vol. 60:6; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
TRANSITION TEMPERATURE
CALCIUM OXIDES
COPPER OXIDES
THALLIUM OXIDES
ANNEALING
CRITICAL CURRENT
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
MAGNETIC SUSCEPTIBILITY
SUPERCONDUCTING FILMS
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
ELECTRIC CURRENTS
FILMS
HEAT TREATMENTS
MAGNETIC PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TEMPERATURE RANGE
THALLIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication