Magnetization behavior and critical current density along the c-axis in melt-grown YBCO fiber crystal

H. Ishii*, T. Hara, S. Hirano, A. M. Figueredo, M. J. Cima

*この研究の対応する著者

研究成果: Article査読

7 被引用数 (Scopus)

抄録

The magnetic-hysteresis behavior of single-crystal YBCO fibers was investigated below 1 T and in the temperature range 40 to 88 K. The sample was prepared by the laser-heated floating zone method. The magnetization curves exhibited a fairly large asymmetry with respect to the field axis, especially at elevated temperatures. This behavior may be attributed to the surface Meissner current contribution. It was demonstrated for the temperature range examined that the magnetic hysteresis width, ΔM, versus external-field curves were well described by assuming that the critical current density in the c-axis direction Jcc obeys the critical-state model of the form Jc(B)=JcO[1+(B/B0)n]-1. Then, in turn, the field dependence of the critical current density along the c-axis at field temperatures was deduced using parameters obtained by fitting the ΔM vs. field curves. It was shown that the critical current density in the direction of the c-axis in our sample was over 104 A/cm2 at 77.3 K below 0.3 T. The field and temperature variations of Jcc were discussed in relation to the previous studies on some melt-processed YBCO.

本文言語English
ページ(範囲)91-100
ページ数10
ジャーナルPhysica C: Superconductivity and its applications
225
1-2
DOI
出版ステータスPublished - 1994 5月 10
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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