Characteristics of ErBa2Cu3O7-δ films with BaWO4 doping

Y. Shingai, T. Numasawa, M. Mukaida, R. Teranishi, R. Kita, A. Ichinose, S. Horii, Y. Yoshida, K. Matsumoto, S. Awaji, K. Watanabe, A. Saito, K. Yamada, N. Mori

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

BaWO4 (BWO) doped ErBa2Cu3O7-δ (Er-123) (BWO + Er-123) films are fabricated and their superconducting properties are evaluated. We discuss the effect of BWO doping into Er-123 films on their crystallinity and superconducting properties. The grown BWO + Er-123 films were in-plane aligned and c-axis oriented. We characterize in-plane crystallinity of the films by XRD in-plane rotation measurement (φ-scan). The full width at a half maximum of the φ-scan pattern (δφ) of the grown BWO + Er-123 films became wider as increasing BWO doping. The critical temperature (TC0) of 2.0 wt% BWO + Er-123 films was about 90.5 K. From this result, it was confirmed that the BWO + Er-123 films had as high TC as pure Er-123 films. Surface resistance (RS) of the BWO + Er-123 films was degraded comparing to that of a pure Er-123 film. The relationships between critical current density (JC) and applied magnetic field (JC-B) and the magnetic field angular dependence of JC of the grown 2.0 wt% BWO + Er-123 film were evaluated at 77 K. As a result, it is confirmed that the JC of the Er-123 films in magnetic fields decreased by the BWO doping comparing to that of the pure Er-123 film. However, it was also confirmed that the 2.0 wt% BWO + Er-123 film had weak pining centers along the c-axis of Er-123 films. From the result of a cross-sectional transmission electron microscope (TEM) image, some rod structures were observed in the 2.0 wt% BWO + Er-123 films. The diameter of the rod was about 20 nm. These rods grew along the c-axis of Er-123 films from the substrate to the surface of the film.

Original languageEnglish
Pages (from-to)909-913
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume463-465
Issue numberSUPPL.
DOIs
Publication statusPublished - 2007 Oct 1

Keywords

  • BaWO
  • Dope
  • ErBaCuO films
  • Pinning center
  • Surface resistance

ASJC Scopus subject areas

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

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