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Effect of a multi-buffer layer (Sm2O3/CeO2) on the superconducting properties of an EuBa2Cu3O7− δthin film

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/j.physc.2005.02.110
Keywords
  • Euba2Cu3O7− δ
  • Sm2O3
  • Ceo2
  • Critical Current Density

Abstract

Abstract In order to suppress the influence of facets, annealing of a thick CeO 2 film and insertion of a Sm 2O 3 buffer layer were carried out. Annealing of R-Al 2O 3 with a 200-nm-thick CeO 2 buffer layer at 1000 °C for 3 h resulted in improvement in the surface morphology and crystallinity of the buffer layer. However, microcracks were observed on the surface of the CeO 2 film, and EuBa 2Cu 3O 7− δ (EBCO) thin films directly deposited on annealed substrates exhibited T ce’s of about 84 K or lower. By depositing 100-nm-thick Sm 2O 3 second buffer layers on annealed CeO 2, EBCO thin films exhibited T ce’s of 90.1 K and J c’s of 5.5 MA/cm 2 at 77.3 K.

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