Y-Ba-Cu-O thick film preparation using multistep KrF excimer laser deposition

K. Ebihara, K. Shingai, Yukihiko Yamagata, T. Ikegami, A. M. Grishin

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Thick films of high-temperature superconductors (HTSC) have attracted much attention to a number of current-carrying applications such as current leads, interconnects, current limiters and cryotron-type switchs. As the film thickness of HTSC films is increased using the conventional method of pulsed laser deposition, the surface morphology Is degraded during the film deposition. This structural transition results in decreasing the critical current density with the film thickness. Here, a multistep deposition technique in the KrF excimer laser ablation is used to prepare Y-Ba-Cu-O thick films. The high-quality Y-Ba-Cu-O superconducting films of thickness of a few mm were formed by optimizing the processing conditions from the bottom to the surface of the film. The initial ultrathin layer of a few nm was prepared at the low repetition rate of 1 Hz at laser fluence 3 J cm-2. Then, various repetition rates at the fluence 2 J cm-2 were chosen for deposition of the intermediate layer and the surface layer, both with thicknesses of about 1 μm. It is shown that surface morphology and vertical growth are significantly dominated by the initial layer structure and the following deposition conditions. The thick films with high Tc(zero) 89 K were obtained when the surface layer was prepared at a lower repetition rate under lower process temperature. The three step procedure prepared the superconducting thick films with the critical current density of 1.2×106 A cm-2 (at 5 K).

Original languageEnglish
Pages (from-to)228-231
Number of pages4
JournalJournal of Alloys and Compounds
Volume251
Issue number1-2
DOIs
Publication statusPublished - Jan 1 1997
Externally publishedYes

Fingerprint

Film preparation
Excimer lasers
Thick films
Superconducting films
High temperature superconductors
Surface morphology
Film thickness
Critical current density (superconductivity)
Limiters
Laser ablation
Pulsed laser deposition
Lasers
Processing
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Y-Ba-Cu-O thick film preparation using multistep KrF excimer laser deposition. / Ebihara, K.; Shingai, K.; Yamagata, Yukihiko; Ikegami, T.; Grishin, A. M.

In: Journal of Alloys and Compounds, Vol. 251, No. 1-2, 01.01.1997, p. 228-231.

Research output: Contribution to journalArticle

Ebihara, K. ; Shingai, K. ; Yamagata, Yukihiko ; Ikegami, T. ; Grishin, A. M. / Y-Ba-Cu-O thick film preparation using multistep KrF excimer laser deposition. In: Journal of Alloys and Compounds. 1997 ; Vol. 251, No. 1-2. pp. 228-231.
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