Influence of coating solution composition on REBa2Cu 3Oy(RE=Gd and Sm,Eu,Gd) films fabricated by fluorine-free metalorganic deposition

T. Nakamura, R. Kita, S. Kawabata, O. Miura, A. Ichinose, K. Matsumoto, Y. Yoshida, M. Mukaida, S. Horii

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Abstract

GdBa2Cu3Oy (GdBCO) and Sm 0.33Eu0.33Gd0.33Ba2Cu 3Oy (SEG) films were prepared by metalorganic deposition (MOD) using two fluorine-free solutions: A metal 2-ethylhexanate (2-EH) and a complex solution (CS) consisting of metal 2-EH and metal-naphthenate. We investigated the effects of these new fluorine-free solutions, and their potential use in the fabrication of several REBCO (RE: rare earth) materials. The crystal growth, surface morphology, and superconducting properties of films prepared on single-crystal LaAlO3 substrates at low oxygen partial pressure strongly depended upon the coating solution used. Films prepared using 2-EH exhibited improved thermal stability of the superconducting phase during heat treatment. On the other hand, films prepared by CS had a flat superconducting matrix, with a roughness of several tens of nm and large precipitates 23 μm in diameter. In addition, the CS films had a higher critical temperature (91.2 K) than the 2-EH film. The zero-field critical current density at 77.3 K was 0.19 MA/cm2 for 2-EH films, and 0.61 MA/cm2 for CS films.

Original languageEnglish
Pages (from-to)1165-1172
Number of pages8
JournalModern Physics Letters B
Volume24
Issue number12
DOIs
Publication statusPublished - May 20 2010

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics

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