The effect of temperature, growth kinetics, and substrate on the microstructure of RF off-axis sputter deposited YBa{sub 2}Cu{sub 3}O{sub 7} thin films Metadata

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Title

  • Main Title The effect of temperature, growth kinetics, and substrate on the microstructure of RF off-axis sputter deposited YBa{sub 2}Cu{sub 3}O{sub 7} thin films

Creator

  • Author: Hawley, M.
    Creator Type: Personal
  • Author: Houlton, R.J.
    Creator Type: Personal
  • Author: Garzon, F.H.
    Creator Type: Personal
  • Author: Raistrick, I.D.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)

Publisher

  • Name: Los Alamos National Laboratory
    Place of Publication: New Mexico
    Additional Info: Los Alamos National Lab., NM (United States)

Date

  • Creation: 1995-07-01

Language

  • English

Description

  • Content Description: YBa{sub 2}Cu{sub 3}O{sub 7} (YBCO) thin films were grown on single crystal substrates by RF off-axis sputter deposition under different growth condition, systematically varied to change the kinetic and thermodynamic processes that determine both the film microstructure and its crystallographic orientation. The effect of substrate temperature, position, and material, total chamber pressure, and RF power on the final film structure was examined. The growth matrix was bounded by temperatures from 640 to 780C, pressures from 50 to 200 mtorr, and power from 50 to 100 watts. Higher growth rates were achieve by increasing the power setting, lowering the total pressure, and moving the substrate farther into the plasma. Care was taken to stay within these parametric stability limits defining the 123-YBCO growth regime. The resulting films were characterized, primarily, by scanning tunneling and atomic force microscopy, x-ray diffraction, and eddy-current measurements. At the extremes of the growth conditions used in this study, ex-situ examination of the films revealed that they spanned the extremes from all c-axis normal to all a-axis normal material, with mixed a-/c-axis normal material in between extremes in deposition parameter limits, with the mixed films containing a-axis material overlaying a c-axis layer. Smooth single orientation films, suitable for multilayer device structure, could be routinely obtained by controlled growth. Highest surface roughness measurements were usually due to incomplete or non uniform a-axis coverage on c-axis films. Combined data obtained from different studies showed that lower temperatures and higher rates favored a-axis growth under the conditions used in these studies. The YBCO films were more unstable to a cross-over from c-axis to a-a-axis growth when deposited on NdGaO{sub 3} and LaAIO{sub 3} than on SrTiO{sub 3}. Under conditions favoring c-axis perpendicular growth, higher temperatures and rates resulted in rounder islands.
  • Physical Description: 4 p.

Subject

  • Keyword: Temperature Dependence
  • Keyword: Lanthanum Oxides
  • Keyword: Strontium Oxides
  • Keyword: Titanium Oxides
  • STI Subject Categories: 36 Materials Science
  • Keyword: Neodymium Oxides
  • Keyword: Barium Oxides
  • Keyword: Gallium Oxides
  • Keyword: Grain Orientation
  • Keyword: Deposition
  • Keyword: Microstructure
  • Keyword: Yttrium Oxides
  • Keyword: Aluminium Oxides
  • Keyword: Sputtering
  • Keyword: Copper Oxides
  • Keyword: Substrates

Source

  • Conference: International workshop on superconductivity: controlled processing of high temperature superconductors - fundamentals and applications, Maui, HI (United States), 18-21 Jun 1995

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Other: DE95015323
  • Report No.: LA-UR--95-1708
  • Report No.: CONF-950637--8
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 102297
  • Archival Resource Key: ark:/67531/metadc626430

Note

  • Display Note: OSTI as DE95015323