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Annealing effect on a boundary layer between oxide superconducting films and a substrate
Author(s) -
Fuchino Shuichiro,
Agatsuma Ko,
Ohara Takeshi,
Kaiho Katsuyuki,
Tateishi Hiroshi
Publication year - 1991
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391110402
Subject(s) - materials science , annealing (glass) , superconductivity , oxide , thin film , substrate (aquarium) , fabrication , layer (electronics) , composite material , optoelectronics , chemical engineering , metallurgy , nanotechnology , condensed matter physics , pathology , geology , medicine , oceanography , physics , alternative medicine , engineering
Since the discovery of the new high Tc superconductor, various kinds of film growth techniques have been reported on fabrication of an oxide superconducting film, especially YBCO and BSCCO above liquid nitrogen temperature. All these techniques require the so‐called post‐growth heat treatment or a heating of the substrate during the deposition to grow an adequate polycrystal which can realize the superconducting state in the oxide. Such a heating process, however, yields some intermediate products at a boundary layer between the starting materials and the substrate, and the products result in degradation of the superconducting property. In this paper, the annealing effect on the growth of YBCO or BSCCO oxide superconducting film and the substrate is investigated by using EDX analysis and SEM examination. To enhance the annealing effect, relatively thin YBCO and BSCCO films are fabricated with the starting materials pasted on substrates, and rather than sputtered thin films used for the analysis. MgO, Al 2 O 3 , SrTiO 3 , 5 or 8 percent Y stabilized ZrO 2 (YTZ or YSZ), and so on, are chosen as a substrate. The results show that the heat treatment yields Ba compounds between YBCO and the substrates and Sr and Bi compounds between BSCCO and the substrates. Since the product boundary layer of the intermediate product is the thinnest, MgO substrate can be recommended for YBCO film, and SrTiO 3 substrate for BSCCO film.