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Characteristics of Rare-Earth-Free Superconducting Thin Films

  • M. Nemoto
  • H. Kuwahara
  • K. Kawaguchi
  • Y. Matsuta
  • M. Nakao
Conference paper

Abstract

Superconducting Tl-Ca-Ba-Cu-0 thin films deposited by rf magnetron sputtering from Tl2Ca2Ba2Cu3Ox, Tl3Ca2Ba2Cu3Ox and Tl2Ca3Ba1Cu3Ox targets were investigated. After post-annealing, the composition of films prepared from the Tl2Ca2Ba2Cu3Ox target was closest to that of the high-T c phase in the targets used. A Tl-Ca-Ba-Cu-O film with zero resistivity at 116 K exhibited the critical current densities of ∼5.5 × 106 A/cm2 at 5.0 K and ∼1.5 × 106 A/cm2 at 50 K. The critical current densities of a randomly oriented Tl-Ca-Ba-Cu-0 film, ∼3.5 × 106 A/cm2 at 5.0 K and ∼8.0 × 105 A/cm2 at 50 K, were larger than those of a highly oriented Bi-Ca-Sr-Cu-O film, -1.1 × 106 A/cm2 at 4.5 K and ∼2.0 × 105 A/cm2 at 40 K. Both the films were comprised of the low-T c phase.

Keywords

Critical Current Density Zero Field Gold Foil Critical State Model Zero Resistivity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Japan 1989

Authors and Affiliations

  • M. Nemoto
    • 1
  • H. Kuwahara
    • 1
  • K. Kawaguchi
    • 1
  • Y. Matsuta
    • 1
  • M. Nakao
    • 1
  1. 1.Sanyo Tsukuba Research CenterTsukuba, 305Japan

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