Transport studies of YBa2Cu3Oy/YxPr 1-xBa2Cu3Oy and YBa2Cu3Oy/R0.7M 0-3MnO3 superlattices, in which R = La or Nd, and M = Ca or Sr

H. C. Yang, J. C. Chen, L. M. Wang, H. H. Sung, H. E. Horng, S. Y. Yang, J. T. Jeng

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Abstract

We report the transport studies of YBa2Cu3Oy/YxPr 1-xBa2Cu3Oy and YBa2Cu3Oy/R1-xMxMnO 3 superlattices in magnetic fields in which R = La or Nd, and M = Ca or Sr. The X-ray diffraction of samples shows superlattice structure. The resistive transition in a magnetic field shows thermal activated behavior. The flux pinning is reduced when the coupling strength between YBCO layers is decreased. The angular dependence of the critical current of YBa2Cu3Oy/PrBa2Cu 3Oy superlattices reveals the dimensionality of superlattices. The magnetoresistance ratio (MR),|Δρ(H = 7 T) - Δρ(H = 0)|/Δρ(H = 7 T), of YBa2Cu3Oy/R1-xM xMnO3 superlattices is affected by the layer coupling of R1-xMxMnO3 layers. The enhancement of the MR ratio in the tri-layer YBa2Cu3Oy/La0.7M 0.3MnO3/YBa2Cu3Oy film in the low temperature regime is significant and has a value of 33650% at T = 75 K. We attribute this enhancement of the MR to the ordering of magnetic moment in ferromagnetic layers in magnetic fields. The results are discussed in terms of existing theories.

Original languageEnglish
Pages (from-to)1837-1846
Number of pages10
JournalJournal of Physics and Chemistry of Solids
Volume62
Issue number9-10
DOIs
Publication statusPublished - 2001 Oct

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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