Pulsed laser deposition of thin superconducting films of Ho1Ba2Cu307-x and Y1Ba2Cu307-x

D. B. Geohegan, D. N. Mashburn, R. J. Culbertson, S. J. Pennycook, J. D. Budai, R. E. Valiga, B. C. Sales, D. H. Lowndes, L. A. Boatner, E. Sonder, D. Eres, D. K. Christen, W. H. Christie

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21 Scopus citations

Abstract

Thin films of Ho1Ba2Cu307_ x and Y1Ba2Cu307__ xwere deposited on SrTi03and A1203 substrates by pulsed laser deposition of high- Tc bulk superconductor pellets in vacuum. Following annealing in 02 at 800–900 °C the films were superconducting with typical Tc(50%) = 89 K and transition widths of 10 K. Rutherford backscattering spectrometry (RBS) and secondary ion mass spectrometry (SIMS) were utilized to study the stoichiometry of the as-deposited films for laser energy densities between 0.11 and 4.5 J cm-2. The films were deficient in holmium and yttrium for energy densities below 0.6 and 0.4 J cm-2, respectively. The films were stoichiometric for fluences above 0.6 J cm-2. In addition, preliminary time dependence and spectroscopic observations of the laser-produced plasma are presented. The results indicate an ablation mechanism that at high energy densities preserves stoichiometry. TEM and x-ray characterization of annealed, superconducting Ho1Ba2Cu307 _ x films on (100) SrTi03showed mixed regions of epitaxially oriented 1:2:3 material with either the c axis or a axis oriented along the surface normal. The a-axis-oriented material grew preferentially in the films with b, c, twinning.

Original languageEnglish (US)
Pages (from-to)1169-1179
Number of pages11
JournalJournal of Materials Research
Volume3
Issue number6
DOIs
StatePublished - Dec 1988

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Geohegan, D. B., Mashburn, D. N., Culbertson, R. J., Pennycook, S. J., Budai, J. D., Valiga, R. E., Sales, B. C., Lowndes, D. H., Boatner, L. A., Sonder, E., Eres, D., Christen, D. K., & Christie, W. H. (1988). Pulsed laser deposition of thin superconducting films of Ho1Ba2Cu307-x and Y1Ba2Cu307-x. Journal of Materials Research, 3(6), 1169-1179. https://doi.org/10.1557/JMR.1988.1169