Jc anisotropy for magnetic field angle in YBCO coated conductor on IBAD-MgO buffered metal tapes

H. Suzuki, Y. Yoshida, Y. Ichino, Y. Takai, S. Awaji, K. Watanabe, M. Yoshizumi, T. Izumi, Y. Shiohara, T. Kato

Research output: Contribution to journalArticlepeer-review

Abstract

We found that YBCO films deposited by the controlled process showed improved superconducting properties in magnetic fields, even without any artificial pinning centers such as BaZrO3 and BaSnO3. The YBCO films with a thickness of 450 nm were deposited on hastelloy tapes with a textured MgO buffer deposited by IBAD (Ion Beam Assist Deposition) method (IBAD-MgO) by PLD method. In the YBCO films on the IBAD-MgO (IBAD-YBCO), the critical current density of 2.9 MA/cm2 at 77 K in self-field and the ratio of Jc(B//c)/Jc(B//a, b) at 1 T was almost unity. Furthermore, we found that the Jc anisotropy changed with surface morphology on underlying buffer layer and YBCO thickness. This means that some c-axis correlated pinning centers are included in the films. From the cross-sectional TEM images of the IBAD-YBCO, there were not so many defects such as dislocations, Y2O3 inclusions and so on. Thus it is considered that some defects such as oxygen heterogeneity, displacement of a local composition and so on are pinning centers, although such defects can not be detected by a present analytical technique.

Original languageEnglish
Pages (from-to)1384-1387
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume470
Issue number20
DOIs
Publication statusPublished - 2010 Nov 1

Keywords

  • Buffer layer
  • Film thickness dependence
  • Grain size

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'J<sub>c</sub> anisotropy for magnetic field angle in YBCO coated conductor on IBAD-MgO buffered metal tapes'. Together they form a unique fingerprint.

Cite this