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

Research output: Contribution to journalArticlepeer-review

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
Externally publishedYes

ASJC Scopus subject areas

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

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