Temperature dependence of critical currents in REBCO thin films with artificial pinning centers

Kaname Matsumoto, Masaya Nishihara, Takamasa Kimoto, Tomoya Horide, Alok Kumar Jha, Yutaka Yoshida, Satoshi Awaji, Ataru Ichinose

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Conventionally, δT c type (order parameter modulation) and δl type (mean free path modulation) pinning mechanisms have been proposed to explain the temperature dependence of the flux pinning of superconducting materials. According to previous studies, it is assumed that the temperature dependence of J c of REBa2Cu3O7 (REBCO, RE =Y, Gd, Sm, etc) films without artificial pinning centers (APCs) is δl type, but it is unidentified when APCs are introduced into the films. In this paper, GdBCO thin films doped with BaHfO3 (BHO) deposited on LaAlO3 substrates by pulsed laser deposition were studied. A target exchange method was used to alternately ablate two targets of pure GdBCO and BHO for introducing nanorods as APCs into GdBCO films. Since the insulative BHO acts as a strong pinning center, the δT c pinning mechanism is expected for the temperature dependence of J c of these thin films. However, the experimental results showed that the J c of the films with BHO nanorods was determined by the δl pinning mechanism over a wide temperature range. In order to explain these unexpected results, we examined the pinning mechanism by nanorods based on a resultant pinning force model.

Original languageEnglish
Article number104006
JournalSuperconductor Science and Technology
Volume30
Issue number10
DOIs
Publication statusPublished - 2017 Sep 11

Keywords

  • REBCO
  • artificial pinning centers
  • critical current
  • flux pinning

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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  • Cite this

    Matsumoto, K., Nishihara, M., Kimoto, T., Horide, T., Jha, A. K., Yoshida, Y., Awaji, S., & Ichinose, A. (2017). Temperature dependence of critical currents in REBCO thin films with artificial pinning centers. Superconductor Science and Technology, 30(10), [104006]. https://doi.org/10.1088/1361-6668/aa835b