Characteristics of YBa2Cu3O7 thin films deposited on substrates buffered by various TiO2 layers

Po Iem Lin*, Chia Wen Liu, Chich Chang Hsieh, Kaung-Hsiung Wu, Jenh-Yih Juang, Tseng Ming Uen, Jiunn-Yuan Lin, Yih Shung Gou

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Titanium nitride (TIN) and superconducting YBa2Cu3O7 (YBCO) thin films have been deposited sequentially on SrTiO3(STO)(100) substrates by in situ pulsed laser ablation. The TiN films were originally intended to serve as the lower contact electrode of the c-axis YBCO thin films. It was found that, although high-quality YBCO films could be obtained with the YBCO/TiN/STO(100) bilayer structure, the TiN(100) layer was oxidized which changed the structure into YBCO/TiO2/STO(100) during YBCO deposition. Comparative studies of depositing YBCO films directly onto a dc-sputtered TiO2/STO(100) template conventionally used in the selective epitaxial growth (SEG) process have, however, resulted in formation of a nonsuperconducting YBCO top layer. The characteristics of the resultant TiO2 layers obtained using various processes were analyzed to delineate the apparent discrepancies.

Original languageEnglish
Pages (from-to)L377-L379
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume40
Issue number4 B
DOIs
StatePublished - 15 Apr 2001

Keywords

  • Oxidation of TiN
  • Pulsed laser deposition
  • Selective epitaxial growth process
  • TiN films
  • YBCO/TiO/STO bilayer structure

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