Growth and characterization of laser-deposited superconducting Bi-Sr-Ca-Cu-O thin films
Superconducting Bi-Sr-Ca-Cu-0 thin films with thickness 400--3,500 [Angstrom] have been deposited on (100) MgO and (100) LaAIO[sub 3] by a pulsed excimer XeCl laser ([gamma] = 308 nm, [tau] = 20 ns, and energy density = 4--5 J/cm[sup 2]). Oxygen pressure during deposition and substrate temperature are 0.1--100 mTorr and 350--750[degrees]C, respectively. The as-deposited films were annealed either inside (in situ) or outside (ex situ) the deposition chamber to improve the crystallinity and the superconducting transition of the films. Formation of 2212 and 2223 phases was controlled by tailoring the deposition and annealing parameters. Corresponding [Tc]'s of these phases in the ex situ films measured by zero-field cooled diamagnetic transition at 10 Oe are 80 K and 110 K; however, the in situ mirror-like shiny films with 2223 phase only exhibit [Tc] = 81 K (or 98 K in an a.c. field of 0.1 Oe at 125 Hz). These films were also characterized by SEM, TEM, SQUID magnetometer and AC susceptometer to study their morphology, microstructure, and magnetic properties. The critical magnetization current density (J[sub c]) of the ex situ films is of the order of 10[sup 7]-10[sup 8] A/cm[sup 2] and 10[sup 5]-10[sup 6] A/cm[sup 2] for H [perpendicular] c-axis and H [parallel] c-axis, respectively, at 7 K up to 5 T. J[sub c] of the in situ films is two orders of magnitude lower than that of the ex situ films, and further enhancement of J[sub c] appears promising if better crystallinity of the in situ films can be achieved. A qualitative phase diagram with respect to the development of 2212 and 2223 phases are discussed.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7123743
- Report Number(s):
- LA-UR-92-3526; CONF-921129-4; ON: DE93003792
- Resource Relation:
- Conference: 39. national symposium of the American Vacuum Society, Chicago, IL (United States), 9-13 Nov 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HIGH-TC SUPERCONDUCTORS
DEPOSITION
SUPERCONDUCTING FILMS
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
MAGNETIC PROPERTIES
MICROSTRUCTURE
PHASE DIAGRAMS
STRONTIUM OXIDES
THIN FILMS
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL STRUCTURE
CURRENTS
DIAGRAMS
ELECTRIC CURRENTS
FILMS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication