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

doi:10.1557/JMR.1988.1169

Pulsed laser deposition of thin superconducting films of Ho₁Ba₂Cu₃0_7-x and Y₁Ba₂Cu₃0_7-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

Oak Ridge National Laboratory

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

Thin films of Ho₁Ba₂Cu₃0₇_ _x and Y₁Ba₂Cu₃0₇__ _xwere deposited on SrTi0₃and A1₂0₃ substrates by pulsed laser deposition of high- T_c bulk superconductor pellets in vacuum. Following annealing in 0₂ at 800–900 °C the films were superconducting with typical T_c(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 language	English
Pages (from-to)	1169-1179
Number of pages	11
Journal	Journal of Materials Research
Volume	3
Issue number	6
DOIs	https://doi.org/10.1557/JMR.1988.1169
State	Published - Dec 1988

Funding

The authors gratefully acknowledge the excellent technical assistance of P. L. Hatmaker, H. E. Harmon, J. O. Ramey, P. H. Fleming and F. M. Rau. This work was sponsored by the Director's Research and Development fund at Oak Ridge National Laboratory and the Division of Materials Science, U.S. Department of Energy, under contract DE-AC05-840R21400 with Martin Marietta Energy Systems, Inc.

Funders	Funder number
Division of Materials Science
U.S. Department of Energy	DE-AC05-840R21400
Oak Ridge National Laboratory

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10.1557/JMR.1988.1169

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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 Ho₁Ba₂Cu₃0_7-x and Y₁Ba₂Cu₃0_7-x. Journal of Materials Research, 3(6), 1169-1179. https://doi.org/10.1557/JMR.1988.1169

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title = "Pulsed laser deposition of thin superconducting films of Ho1Ba2Cu307-x and Y1Ba2Cu307-x",

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.",

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

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doi = "10.1557/JMR.1988.1169",

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AU - Geohegan, D. B.

AU - Mashburn, D. N.

AU - Culbertson, R. J.

AU - Pennycook, S. J.

AU - Budai, J. D.

AU - Valiga, R. E.

AU - Sales, B. C.

AU - Lowndes, D. H.

AU - Boatner, L. A.

AU - Sonder, E.

AU - Eres, D.

AU - Christen, D. K.

AU - Christie, W. H.

PY - 1988/12

Y1 - 1988/12

N2 - 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.

AB - 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.

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Pulsed laser deposition of thin superconducting films of Ho₁Ba₂Cu₃0_7-x and Y₁Ba₂Cu₃0_7-x

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