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Microstructure and microwave loss studies on epitaxial YBa2Cu3Ox thin films

Selinder, TI ; Han, Z ; Helmersson, Ulf ; Rudner, S ; Wernlund, LD and Wallenberg, LR LU (1992) p.219-224
Abstract
Thin YBa2Cu3Ox films were grown on SrTiO3 or LaAlO3 single crystals by dc-magnetron reactive sputtering in argon/oxygen gas mixtures. Deposition temperatures ranged from 540 °C to 780 °C. After deposition and subsequent cool down, films grown above 680 °C are superconducting below 86–88 K. All films are oriented with the [001] direction parallel to the [001] substrate normal. The best films have critical current densities well above 106 A/cm2, and effective 6 GHz surface resistance values below 300 μω, at 77 K. Despite good electrical properties, the films are littered with copper rich particles on a smooth and epitaxial single crystalline surface. Cross-section Transmission Electron Microscopy (X-TEM) was used to study the crystalline... (More)
Thin YBa2Cu3Ox films were grown on SrTiO3 or LaAlO3 single crystals by dc-magnetron reactive sputtering in argon/oxygen gas mixtures. Deposition temperatures ranged from 540 °C to 780 °C. After deposition and subsequent cool down, films grown above 680 °C are superconducting below 86–88 K. All films are oriented with the [001] direction parallel to the [001] substrate normal. The best films have critical current densities well above 106 A/cm2, and effective 6 GHz surface resistance values below 300 μω, at 77 K. Despite good electrical properties, the films are littered with copper rich particles on a smooth and epitaxial single crystalline surface. Cross-section Transmission Electron Microscopy (X-TEM) was used to study the crystalline quality on a microscopic level, and the nature of particles occurring on/in the as grown film. Small misaligned YBa2Cu3Ox grains often occur in the films. The large copper rich particles on the film surface seem to have nucleated at such grains on the film surface. Their occurrence can, at least partly, be explained by a nonstoichiometric flow to the substrate. The number density of the particles decreased with increasing growth temperature but the volume density seemed to be constant in the investigated temperature interval. (Less)
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author
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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
High Tc superconductor thin films
editor
Correra, L
pages
6 pages
publisher
ELSEVIER SCIENCE PUBL B V
ISBN
0-444-89353-9
DOI
10.1016/B978-0-444-89353-6.50040-3
language
English
LU publication?
yes
id
f00190a6-48f0-4939-80ef-7f5f340fb9b9
date added to LUP
2023-10-31 14:55:05
date last changed
2023-11-03 09:21:19
@inproceedings{f00190a6-48f0-4939-80ef-7f5f340fb9b9,
  abstract     = {{Thin YBa2Cu3Ox films were grown on SrTiO3 or LaAlO3 single crystals by dc-magnetron reactive sputtering in argon/oxygen gas mixtures. Deposition temperatures ranged from 540 °C to 780 °C. After deposition and subsequent cool down, films grown above 680 °C are superconducting below 86–88 K. All films are oriented with the [001] direction parallel to the [001] substrate normal. The best films have critical current densities well above 106 A/cm2, and effective 6 GHz surface resistance values below 300 μω, at 77 K. Despite good electrical properties, the films are littered with copper rich particles on a smooth and epitaxial single crystalline surface. Cross-section Transmission Electron Microscopy (X-TEM) was used to study the crystalline quality on a microscopic level, and the nature of particles occurring on/in the as grown film. Small misaligned YBa2Cu3Ox grains often occur in the films. The large copper rich particles on the film surface seem to have nucleated at such grains on the film surface. Their occurrence can, at least partly, be explained by a nonstoichiometric flow to the substrate. The number density of the particles decreased with increasing growth temperature but the volume density seemed to be constant in the investigated temperature interval.}},
  author       = {{Selinder, TI and Han, Z and Helmersson, Ulf and Rudner, S and Wernlund, LD and Wallenberg, LR}},
  booktitle    = {{High Tc superconductor thin films}},
  editor       = {{Correra, L}},
  isbn         = {{0-444-89353-9}},
  language     = {{eng}},
  pages        = {{219--224}},
  publisher    = {{ELSEVIER SCIENCE PUBL B V}},
  title        = {{Microstructure and microwave loss studies on epitaxial YBa2Cu3Ox thin films}},
  url          = {{http://dx.doi.org/10.1016/B978-0-444-89353-6.50040-3}},
  doi          = {{10.1016/B978-0-444-89353-6.50040-3}},
  year         = {{1992}},
}