Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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The Study of Different Buffer Structure on Ni-W Tape for SmBCO Coated Conductor

  • Kim, T.H. (Korea Electrotechnology Research Institute, Department of Materials science and Metallurgy, Kyungpook National Univ.) ;
  • Kim, H.S. (Korea Electrotechnology Research Institute) ;
  • Oh, S.S. (Korea Electrotechnology Research Institute) ;
  • Ko, R.K. (Korea Electrotechnology Research Institute) ;
  • Ha, D.W. (Korea Electrotechnology Research Institute) ;
  • Song, K.J. (Korea Electrotechnology Research Institute) ;
  • Lee, N.J. (Korea Electrotechnology Research Institute) ;
  • Yang, J.S. (Korea Electrotechnology Research Institute) ;
  • Jung, Y.H. (Department of Physics, KAIST) ;
  • Youm, D.J. (Department of Physics, KAIST) ;
  • Park, K.C. (Department of Materials science and Metallurgy, Kyungpook National Univ.)
  • Published : 2006.11.30
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Abstract

High temperature superconducting coated conductor has various buffer structures on Ni-W alloy. We comparatively studied the growth conditions of a multi buffer layer $(CeO_2/YSZ/CeO_2)$ and a single buffer layer$(CeO_2)$ on textured Ni-W alloy tapes. XRD data showed that the qualities of in-plane and out-of-plane textures of the two type buffer structures were good. Also, we investigated the properties of SmBCO superconducting layer that was deposited on the two type buffer structure. The SmBCO superconducting properties on the single and multi buffer structure showed different critical current values and surface morphologies. FWHM of In-plane and out-of-plane textures were $7.4^{\circ},\;5.0^{\circ}$ in the top CeO2 layer of the multi-buffer layers of $CeO_2/YSZ/CeO_2$, and $7.3^{\circ},\;5.1^{\circ}$ in the $CeO_2$ single buffer layer. $1{\mu}m-thick$ SmBCO superconducting layers were deposited on two type buffer layer. $I_c$ of SmBCO deposited on single and multi buffer were 90 A/cm, 150 A/cm and corresponding $J_c$ were $0.9MA/cm^2,\;1.5MA/cm^2$ at 77K in self-field, respectively.

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References

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