High-Ic processing for YBCO coated conductors by TFA-MOD process

Ryo Teranishi, Junko Matsuda, Koichi Nakaoka, Hiroshi Fuji, Yuji Aoki, Yutaka Kitoh, Sukeharu Nomoto, Yutaka Yamada, Akimasa Yajima, Teruo Izumi, Yuh Shiohara

Research output: Contribution to journalConference articlepeer-review

12 Citations (Scopus)

Abstract

YBCO films were fabricated on PLD-CeO2/IBAD-Gd 2Zr2 O7/Hastelloy substrates using the TFA-MOD process. In order to obtain higher Ic performance, the thicker films maintaining high-Jc values are required. Jc depended strongly on the PH2O during the crystallization in the process. The pore size was smaller in the high-Jc films crystallized under the medium PH2O condition and became larger in the low-Jc films under both lower and higher PH2O for the YBCO films with a constant thickness. Furthermore, crack generation was observed in thick films crystallized at the high PH2O condition. Consequently, both pore and crack formations limit the Jc properties since large pore causes local reduction of current paths and additionally results in local concentration of electric fields. Jc also depended strongly on the YBCO crystal grain alignment which is affected by in-plane grain alignment of the buffered substrate. Then, the effect of in-plane grain alignment of the CeO2 cap layer on Jc was investigated for thicker YBCO films. As a result, the Jc value increased with improvement of the crystal alignment of the CeO2 cap layers. Finally, a YBCO film with a high-Ic value of 413 A at 77 K in self-field was achieved in a film fabricated on Δφ = 4° of the CeO2 layer using the appropriate crystallization conditions for crack-free film.

Original languageEnglish
Pages (from-to)959-965
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume426-431
Issue numberII
DOIs
Publication statusPublished - Oct 7 2005
Externally publishedYes
EventProceedings of the 17th Internatioanl Symposium on Superconductivity (ISS 2004) Advances in Superconductivity -
Duration: Nov 23 2004Nov 25 2004

All Science Journal Classification (ASJC) codes

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

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