Superconducting YBa2Cu3O7 films grown on TiO2 buffer layers derived from various processes

Kaung-Hsiung Wu*, P. I. Lin, C. C. Hsieh, S. J. Liu, Jenh-Yih Juang, T. M. Uen, Jiunn-Yuan Lin, Y. S. Gou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


YBa2Cu3O7 (YBCO)/TiN and YBCO/TiO2 bilayer structures have been prepared on SrTiO3 (STO)(100) substrates by in situ pulsed laser deposition (PLD). The TiN films were originally intended to serve as the lower contact electrode for studying the c-axis transport properties of YBCO thin films. It was found that, under the optimum conditions of depositing YBCO thin films, the TiN(100) layer was oxidized and transformed into rutile TiO2(110) film. On the other hand, pure anatase TiO2(001) films were prepared by PLD using a rutile TiO2(110) substrate as the target. YBCO films grown on both phases of TiO2 films show virtually the same transport properties of typical good quality single-layer YBCO films. Comparative studies of depositing YBCO films directly onto a dc-sputtered TiO2 template commonly used in the selective epitaxial growth process have, however, resulted in formation of a nonsuperconducting YBCO top layer. Experiments including interfacial X-ray absorption spectroscopy for determining the possible interactions occurring at the YBCO and TiO2 interface are reported.

Original languageAmerican English
Pages (from-to)119-129
Number of pages11
JournalPhysica C: Superconductivity and its applications
Issue number2
StatePublished - 1 Nov 2001


  • Oxidation of TiN
  • Pulsed laser deposition
  • Selective epitaxial growth technique
  • TiN films
  • TiOfilms
  • X-ray absorption spectroscopy
  • YBCO/TiO/STO bilayer structur


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