Control of Y2O3 nanoislands deposition parameters in order to induce defects formation and its influence on the critical current density of YBCO films

Paolo Mele, K. Matsumoto, T. Horide, O. Miura, A. Ichinose, M. Mukaida, Y. Yoshida, S. Horii

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

We successfully introduced high-density linear defects as artificial pinning centers (APCs) of the quantized vortices into YBCO films, during the film deposition procedure. APCs were introduced perpendicular to the film surface by using the distributed nanosized Y2O3 islands prepared on SrTiO3(1 0 0) substrates. It is possible to induce strong changes on the shape and density of the Y2O3 islands by varying the deposition conditions. The highest Y2O3 islands density, 226/μm2, was obtained with fifteen laser pulses at 800 °C of substrate temperature. Even if only 10% of the induced defects act as effective pinning centers, Jc of YBCO film grown on the Y 2O3 nanoislands/SrTiO3 substrate increased to 1.8 × 107 A/cm2 (20 K, B∥c, 0 T), which is 1.5 times higher than that of the pure YBCO film.

Original languageEnglish
Pages (from-to)1108-1112
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume426-431
Issue numberII
DOIs
Publication statusPublished - 2005 Oct 7
Externally publishedYes
EventProceedings of the 17th Internatioanl Symposium on Superconductivity (ISS 2004) Advances in Superconductivity -
Duration: 2004 Nov 232004 Nov 25

Fingerprint

critical current
current density
Defects
defects
Substrates
Laser pulses
Vortex flow
vortices
pulses
lasers
Temperature
temperature
strontium titanium oxide

Keywords

  • Artificial pinning center
  • J
  • Vortex pinning
  • YBCO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Control of Y2O3 nanoislands deposition parameters in order to induce defects formation and its influence on the critical current density of YBCO films. / Mele, Paolo; Matsumoto, K.; Horide, T.; Miura, O.; Ichinose, A.; Mukaida, M.; Yoshida, Y.; Horii, S.

In: Physica C: Superconductivity and its Applications, Vol. 426-431, No. II, 07.10.2005, p. 1108-1112.

Research output: Contribution to journalConference article

Mele, Paolo ; Matsumoto, K. ; Horide, T. ; Miura, O. ; Ichinose, A. ; Mukaida, M. ; Yoshida, Y. ; Horii, S. / Control of Y2O3 nanoislands deposition parameters in order to induce defects formation and its influence on the critical current density of YBCO films. In: Physica C: Superconductivity and its Applications. 2005 ; Vol. 426-431, No. II. pp. 1108-1112.
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AU - Mele, Paolo

AU - Matsumoto, K.

AU - Horide, T.

AU - Miura, O.

AU - Ichinose, A.

AU - Mukaida, M.

AU - Yoshida, Y.

AU - Horii, S.

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N2 - We successfully introduced high-density linear defects as artificial pinning centers (APCs) of the quantized vortices into YBCO films, during the film deposition procedure. APCs were introduced perpendicular to the film surface by using the distributed nanosized Y2O3 islands prepared on SrTiO3(1 0 0) substrates. It is possible to induce strong changes on the shape and density of the Y2O3 islands by varying the deposition conditions. The highest Y2O3 islands density, 226/μm2, was obtained with fifteen laser pulses at 800 °C of substrate temperature. Even if only 10% of the induced defects act as effective pinning centers, Jc of YBCO film grown on the Y 2O3 nanoislands/SrTiO3 substrate increased to 1.8 × 107 A/cm2 (20 K, B∥c, 0 T), which is 1.5 times higher than that of the pure YBCO film.

AB - We successfully introduced high-density linear defects as artificial pinning centers (APCs) of the quantized vortices into YBCO films, during the film deposition procedure. APCs were introduced perpendicular to the film surface by using the distributed nanosized Y2O3 islands prepared on SrTiO3(1 0 0) substrates. It is possible to induce strong changes on the shape and density of the Y2O3 islands by varying the deposition conditions. The highest Y2O3 islands density, 226/μm2, was obtained with fifteen laser pulses at 800 °C of substrate temperature. Even if only 10% of the induced defects act as effective pinning centers, Jc of YBCO film grown on the Y 2O3 nanoislands/SrTiO3 substrate increased to 1.8 × 107 A/cm2 (20 K, B∥c, 0 T), which is 1.5 times higher than that of the pure YBCO film.

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