Macroscopic persistent currents in laser ablated YBa2Cu3O7-x films

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2011
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Stritzker, Bernd
Feile, Rudolf
Krüger, U.
Zander, W.
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Thin films of YBa2Cu3O7-x have been produced in situ by laser ablation. As the condensation of the superconducting film is done onto hot substrates (600-780°C) at high oxygen pressures (- 1 mbar), this techniques does not require any special postannealing step. Thus the total process time amounts to less than 10 min. Films were found to be polycrystalline with the c-axis preferentially oriented normal to the substrate plane on single crystalline (001) SrTiO3 and (random) Zr=2, as measured by ion channeling (Xmin = 5.5% on SrTiO3), x-ray scattering and TEM. Complete superconducting transitions above 90 K with transition widths of about 1 K have been observed even on YSZ substrates. Critical current densities, jc (77 K), of more than 2 x 10 6 A/cm2 could be obtained on SrTiO3-substrates. The high quality of the thin films over large areas was demonstrated by the measurement of persistent superconducting current densities at 77 K in the order of 10 5 A/cm2 in a 1.5 mm broad ring of 9 mm diameter. No dissipation of this persistent current could be observed during one hour. Measurement of the same film after 8 months in normal air showed a 40% decrease of jc and a stronger decrease of jc with an externed magnetic field, suggesting that in the meantime the macroscopic ring current density is dominated by intergranular weak links.

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ISO 690STRITZKER, Bernd, Paul LEIDERER, Rudolf FEILE, U. KRÜGER, W. ZANDER, 2011. Macroscopic persistent currents in laser ablated YBa2Cu3O7-x films. In: MRS Proceedings. 2011, 169. eISSN 1946-4274. Available under: doi: 10.1557/PROC-169-899
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@article{Stritzker2011-02-28Macro-8942,
  year={2011},
  doi={10.1557/PROC-169-899},
  title={Macroscopic persistent currents in laser ablated YBa2Cu3O7-x films},
  volume={169},
  journal={MRS Proceedings},
  author={Stritzker, Bernd and Leiderer, Paul and Feile, Rudolf and Krüger, U. and Zander, W.}
}
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    <dcterms:abstract xml:lang="eng">Thin films of YBa2Cu3O7-x have been produced in situ by laser ablation. As the condensation of the superconducting film is done onto hot substrates (600-780°C) at high oxygen pressures (- 1 mbar), this techniques does not require any special postannealing step. Thus the total process time amounts to less than 10 min. Films were found to be polycrystalline with the c-axis preferentially oriented normal to the substrate plane on single crystalline (001) SrTiO3 and (random) Zr=2, as measured by ion channeling (Xmin = 5.5% on SrTiO3), x-ray scattering and TEM. Complete superconducting transitions above 90 K with transition widths of about 1 K have been observed even on YSZ substrates. Critical current densities, jc (77 K), of more than 2 x 10 6 A/cm2 could be obtained on SrTiO3-substrates. The high quality of the thin films over large areas was demonstrated by the measurement of persistent superconducting current densities at 77 K in the order of 10 5 A/cm2 in a 1.5 mm broad ring of 9 mm diameter. No dissipation of this persistent current could be observed during one hour. Measurement of the same film after 8 months in normal air showed a 40% decrease of jc and a stronger decrease of jc with an externed magnetic field, suggesting that in the meantime the macroscopic ring current density is dominated by intergranular weak links.</dcterms:abstract>
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