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Synthesis of Bi2Sr2CanCun+1Ox Films by Multilayer Deposition Technique

  • Junich Sato
  • Masatsugu Kaise
  • Keikichi Nakamura
  • Keiichi Ogawa

Abstract

Soon after the discovery of high Tc superconductors in Bi-Sr-Ca-Cu -O systemsl, i.e., 80 K and 110 K phases, it was realized that the 110 K mono phase was extremely difficult to be synthesized by the conventional solid state reaction. Frequent intergrowth of many phases, i.e. Bi2Sr2CanCun+1Ox (n=0–6) are observed2. This suggests that the free energy of these phases has no sharp minimum against the number of CaCu layers sandwitched with two neighboring Bi2O2 layers. The sequential deposition technique is one of the most promising methods to obtain non equilibrium or metastable material having layered structure. We have attempted to synthesize the phases with n=0,1,2 or 3. In this paper we shall report on our sequential vapor deposition technique, characterization of the resultant multilayered films by X-ray diffraction and by SEM and finally their superconducting transion.

Keywords

Substrate Temperature Multilayered Film Conventional Solid State Reaction Sharp Minimum Present Film 
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References

  1. 1).
    H. Maeda, Y. Tanaka, M. Fukutomi and T. Asano, A new high Tc oxide superconductor without a rare earth element, Jpn. J. Appl. Phys., 27: L209 (1988)Google Scholar
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    S. Ikeda, H. Ichinose, T. Kimura, T. Matsumoto, H. Maeda, Y. Ishida and K. Ogawa, TEM studies of intergrowth in BiSrCaCu O and high Tc superconducting phase, Jpn. J. Appl. Phys., 27: L999 (1988).ADSCrossRefGoogle Scholar
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    H. Adachi, S. Kohiki, K. Setsune, T. Matsuyu and K. Basa, Formation of superconducting Bi-Sr-Ca-Cu-O thin films with controlled c-axis lattice spacings by multi-target sputtering, Jpn. J. Appl. Phys., 27: L1883 (1988).Google Scholar

Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • Junich Sato
    • 2
  • Masatsugu Kaise
    • 1
  • Keikichi Nakamura
    • 1
  • Keiichi Ogawa
    • 1
  1. 1.National Research Institute for MetalsTsukuba 305Japan
  2. 2.Metal Research LaboratoryHitach Cable Ltd.Hitachi 317Japan

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