Local structure and superconducting properties of YBCO films grown by Co-evaporation

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High-rate in-situ YBa 2Cu 3O 7-δ (YBCO) film growth was demonstrated by means of electron beam co-evaporation. Even though our oxygen pressure was low, ∼5 × 10 -5 Torr, we could synthesize as-grown superconducting YBCO films at a deposition rate of around 10 nm/s, with a critical current density (J c) of more than 2.0 MA/cm 2. Relatively high temperatures of around 900 °C have been necessary in this process so far, which suggests that this temperature at a given oxygen activity allows Ba-Cu-O liquid formation along with YBCO epitaxy. We report that the local critical current density shows a clear correlation with the local resistivity. Homogeneous transport properties with a high superconducting transition temperature (89-90 K) are observed in top-faulted region while it is found that the bottom part is found to carry little supercurrent with a large local resistivity. The information derived in this study may be useful in the characterization and optimization of superconducting thin films for electric power and other applications.

Original languageEnglish
Pages (from-to)1138-1142
Number of pages5
JournalJournal of the Korean Physical Society
Issue number5 I
StatePublished - May 2006


  • Films
  • Local structure
  • Superconductors
  • Transport properties


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