Growth and characterization of laser-deposited superconducting Bi--Sr--Ca--Cu--O thin films
- Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Superconducting Bi--Sr--Ca--Cu--O thin films with thickness 400--3500 A have been deposited on (100) MgO and (100) LaAlO[sub 3] by a pulsed excimer XeCl laser ([lambda]=308 nm, [tau]=20 ns, and energy density=4--5 J/cm[sup 2]). The oxygen pressure during deposition and the substrate temperature are in the range of 0.1--100 mTorr and 350--750 [degree]C, respectively. The as-deposited films were annealed either inside ([ital in] [ital situ]) or outside ([ital ex] [ital situ]) the deposition chamber to improve the crystallinity and the superconducting transition of the films. The formation of 2212 and 2223 phases was controlled by tailoring the deposition and annealing parameters. The corresponding transition temperatures ([ital T][sub [ital c]]'s) of these phases in the [ital ex] [ital situ] films measured by zero-field cooled diamagnetic transition at 10 Oe are 80 and 110 K; however, the [ital in] [ital situ] mirrorlike shiny films with 2223 phase only exhibit [ital T][sub [ital c]]=81 K (or 98 K in an ac field of 0.1 Oe at 125 Hz). These films were also characterized by scanning electron microscopy, transmission electron microscopy, superconducting quantum interference device magnetometer, and ac susceptometer to study their morphology, microstructure, and magnetic properties. The critical magnetization current density ([ital J][sub [ital c]]) of the [ital ex] [ital situ] films is of the order of 10[sup 7]--10[sup 8] and 10[sup 5]--10[sup 6] A/cm[sup 2] for [ital H][perpendicular][ital c] axis and [ital H][parallel][ital c] axis, respectively, at 7 K up to 5 T. [ital J][sub [ital c]] of the [ital in] [ital situ] films is two orders of magnitude lower than that of the [ital ex] [ital situ] films, and further enhancement of [ital J][sub [ital c]] appears promising if better crystallinity of the [ital in] [ital situ] films can be achieved.
- OSTI ID:
- 6238625
- Journal Information:
- Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States), Vol. 11:4; ISSN 0734-2101
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BISMUTH OXIDES
PHYSICAL PROPERTIES
VACUUM COATING
CALCIUM OXIDES
COPPER OXIDES
STRONTIUM OXIDES
ANNEALING
CRITICAL CURRENT
HIGH-TC SUPERCONDUCTORS
MAGNETIC PROPERTIES
MICROSTRUCTURE
PHASE DIAGRAMS
SUPERCONDUCTING FILMS
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
DEPOSITION
DIAGRAMS
ELECTRIC CURRENTS
FILMS
HEAT TREATMENTS
OXIDES
OXYGEN COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
SURFACE COATING
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)