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Magnetization and Critical Current of Yb1Ba2Cu3O7-x Samples Prepared by the Plasma-ark Melting and Rapid Quenching Method

  • Yorinobu Yoshisato
  • Toshiaki Yokoo
  • Maruo Kamino
  • Hiroshi Suzuki
  • Shoichi Nakano
  • Yukinori Kawano
Conference paper

Abstract

The dependence of magnetization (σ) and critical current density (Jc) on annealing temperature was investigated for Yb1Ba2Cu3O7-x superconductor prepared by the plasma-arc melting and rapid quenching method (PMQ-method). It was found that σ and the superconducting volume fraction increased with annealing temperatures up to 980 °C and reached maximum values of 1.98 emu/g and 90% respective-ly, where particle size also increased to over 25 μm. Futhermore at annealing temperature of more than 980°C, drastic changes in the magnetization curves and an increase in Jc were observed. From X-ray diffraction analysis and EPMA observation, it was found that small Yb2Ba1Cu1O5 particles (1mm diameter) segregated in the large Yb1Ba2Cu3O7-x grain (25 ym diameter). Using the high density and large grain of Yb1Ba2Cu3O7-x ceramics prepared by the PMQ method, grain-boundary Josephson junction effects were examined. Bridges with S-N-I-N-S weak links were fabricated with good reproducibility and showed microwave induced Shapiro steps at 77K.

Keywords

Magnetization Curve Critical Current Density Josephson Junction Magnetic Field Dependence Mechanical Procedure 
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

  • Yorinobu Yoshisato
    • 1
  • Toshiaki Yokoo
    • 1
  • Maruo Kamino
    • 1
  • Hiroshi Suzuki
    • 1
  • Shoichi Nakano
    • 1
  • Yukinori Kawano
    • 1
  1. 1.Functional Materials Research CenterSanyo Electric Co., Ltd.Hirakata, Osaka, 573Japan

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