Superconducting Tl-Ca-Ba-Cu-O thin films by reactive magnetron sputtering

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6616500

Chen, D H; Sabatini, R L; Qiu, S L; Di Marzio, D; Heald, S M; Wiesmann, H

Superconducting Tl-Ca-Ba-Cu-O thin films with T/sub c/ onsets of 115 K and T/sub c/ (R=O) of 95 K have been prepared by reactive magnetron sputtering using Tl, Cu and Ca/Ba metal targets. It was found that proper thallium content is crucial for obtaining a high transition temperature. Wet oxygen and a sealed gold tube with additional thallium compounds were used to reduce the loss of thallium during annealing. X-ray diffraction spectra show that films with the sharpest transition at 95 K are predominantly c-axis oriented. XANES also shows a preferred c-axis orientation for the superconducting film, while for a nonsuperconducting film the near edge structure suggests greater disorder. X-ray microprobe fluorescence measurements indicate that these films are close to the 2122 stoichiometry. Scanning electron microscopy on these films is also presented. 10 refs., 5 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6616500
• Report Number(s): BNL-41685; CONF-881002-41; ON: DE89005649
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALINE EARTH METALS
BARIUM
CALCIUM
COHERENT SCATTERING
COPPER
CRITICAL TEMPERATURE
DATA
DIFFRACTION
ELECTRON TUBES
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
FABRICATION
FILMS
INFORMATION
MAGNETRONS
METALS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
NONMETALS
NUMERICAL DATA
OXYGEN
PHYSICAL PROPERTIES
SCATTERING
SPUTTERING
SUPERCONDUCTING FILMS
THALLIUM
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION