High critical current densities in ultrathin YBa2Cu 3O7-δ films sandwiched between (PrxY 1-x)Ba2Cu3O7-δ layers

C. Kwon, Qi Li, X. X. Xi, S. Bhattacharya, C. Doughty, T. Venkatesan, H. Zhang, J. W. Lynn, J. L. Peng, Z. Y. Li, N. D. Spencer, K. Feldman

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YBa2Cu3O7-δ (YBCO) films with nominal thicknesses of 1-4 unit cells were grown by pulsed laser deposition using (PrxY1-x)Ba2Cu3O 7-δ [(PrxY1-x)BCO] (1≥x≥0) as buffer layers and cap layers. The films of 1 unit cell thick were superconducting for all the x values while Tc increased when x was reduced. For adjacent layers of (Pr0.6Y0.4)BCO which is semiconducting, a Tc of 43 K and Jc of 2×10 6 A/cm2 for B∥ab and 4×105 A/cm 2 for B⊥ab at B=7 T and 4.2 K were obtained in a one-unit cell thick YBCO layer. The Jc values of a few unit cell thick YBCO layers nearly approached that of thick YBCO films. The results suggest the absence of significant weak-link effects in these films.

Original languageEnglish (US)
Pages (from-to)1289-1291
Number of pages3
JournalApplied Physics Letters
Issue number11
Publication statusPublished - Dec 1 1993


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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