Growth and characterization of conductive SrRuO 3 and LaNiO 3 multilayers on textured Ni tapes for high-J c Yba 2 Cu 3 O
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T. Verebelyi American Superconductor Corporation, Two Technology Drive, Westborough, Massachusetts 01581
J.Z. Wu Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045
R.E. Ericson and C.L. Thomas 3M Company, St. Paul, Minnesota 55144
C-Y. Yang and S.E. Babcock Department of Materials Science and Engineering and Applied Superconductivity Center, University of Wisconsin—Madison, Madison, Wisconsin 53706 (Received 2 February 2001; accepted 2 July 2001)
Power applications of high-temperature superconducting (HTS) coated conductors will require stabilization against thermal runaway. We have developed conductive buffer layers to electrically couple the HTS layer to the underlying metal substrate. The structure comprises the layer sequence of SrRuO3 (SRO) on LaNiO3 (LNO) on biaxially textured Ni substrates. We report baseline investigations of compatibility of SRO/LNO multilayer structure with processing of YBa2Cu3O7−␦ (YBCO) and demonstrate biaxially textured YBCO films on conductively buffered Ni tapes. These YBCO coatings exhibit self-field Jc values as high as 1.3 × 106 A/cm2 at 77 K, and the entire structure (HTS + conductive buffers + metal substrate) shows good electrical connectivity. These results demonstrate that SRO/LNO buffer layers may provide a basis for stabilized coated conductors.
I. INTRODUCTION
The recently developed process of rolling-assisted biaxially textured substrates (RABiTS) has emerged as a viable technique for the fabrication of long-length hightemperature superconducting wires (HTS coated conductors).1,2 These HTS coated conductors, formed on Ni and/or Ni-alloy substrates, would enable high-current and high-magnetic-field applications operating at liquidnitrogen temperatures. The technique employs simple, well established, and industrially scalable thermomechanical processing to obtain sharp biaxially cubetextured metal tapes that can be produced over long lengths. These biaxially textured metallic substrates
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e-mail: [email protected] J. Mater. Res., Vol. 16, No. 9, Sep 2001
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serve as templates for the deposition of epitaxial buffer layers that provide a barrier to chemical interactions with Ni and at the same time yield chemically and structurally compatible surfaces for the epitaxial growth of HTS films. Major potential applications of HTS coated conductors involve the efficient production, distribution, and storage of electrical power. Ideally, for these applications conductive-oxide buffer layers are preferred as they can provide an electrical contact between the thin HTS layer and the thick underlying metal substrate. This electrical coupling reduces the overall resistivity and, consequently, improves the electrical and thermal stability of the entire structure (HTS + conductive buffers + metal substrate) in the event of a transient to the dissipative regime. To date however, buffer-layer development for coated conductors has mainly concentrated on insulating oxides and multilayers.1– 4 Th
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