Coupling behavior of Cu-O2 layers in oxygen-deficient YBCO films and ultrathin YBCO films

H. C. Yang*, H. H. Sung, C. H. Chung, H. E. Horng, C. H. Lin

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

We have measured the resistivity as a function of temperature in a magnetic field at various field angles θ for oxygen-deficient YBCO films and ultrathin YBCO films; θ is the angle between the crystal c axis and the direction of the magnetic field. The angular dependence of the critical field, Hc2, shows a cusplike behaviour at θ=90° for the oxygen-deficient 60 K YBCO films indicating that the Cu-O2 layers are two-dimensional in nature. Both Tc versus θ in a constant field and Hc2 as a function of θ show a plateau at θ=90° for 83 K (zero resistance) ultrathin YBCO films with a thickness of 20 units of the YBCO cell; these results indicate that there is a coupling between the Cu-O2 layers. The dimensionality of the Cu-O2 layers in oxygen-deficient YBCO films and ultrathin YBCO films is discussed in terms of the anisotropic Ginzburg-Landau model and the Tinkham thin-film model.

原文英語
頁(從 - 到)467-473
頁數7
期刊Journal of Low Temperature Physics
90
發行號5-6
DOIs
出版狀態已發佈 - 1993 3月

ASJC Scopus subject areas

  • 原子與分子物理與光學
  • 一般材料科學
  • 凝聚態物理學

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