Geometry dependence of intergranular currents in sintered YBa2Cu3O7-δ

Th Schuster, M. R. Koblischka, H. Kuhn, B. Ludescher, H. Kronmüller

研究成果: Article査読

3 被引用数 (Scopus)

抄録

Using standard four-point terminal measurements, the intergranular critical current densities jJc(T, B) of sintered YBa2Cu3O7-δ samples are determined. The dependence of the critical current density on the sample geometry (height h and width b of parallel- epiped samples) is measured systematically for various temperatures (5K ≤ T ≤ 91 K) and low applied external magnetic fields (0 mT ≤ μ0Hext ≤ 10 mT). It is shown that the intergranular critical current density increases on reducing the sample height or width, if no external magnetic field is applied to the sample. The results are discussed using a model assuming the currents flowing in a surface layer of the sample. A reduction of the height or width of the sample changes the circumferences and not the current itself, thus implying an enhancement of the critical current density, jJc(T, B). It is found that the increase of jJc(T, B) on reducing the sample dimensions is limited by the Josephson penetration depth, λJ(T). This penetration depth, λJ(T), turns out to be a very important parameter to reach high intergranular critical current densities in sintered high-Tc superconductors.

本文言語English
ページ(範囲)249-255
ページ数7
ジャーナルPhysica C: Superconductivity and its applications
202
3-4
DOI
出版ステータスPublished - 1992 11 15
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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