Vortex pinning at low temperature under high magnetic field in SmBa2Cu3Oy superconducting films with high number density and small size of BaHfO3 nano-rods

S. Miura, Y. Yoshida, Y. Ichino, A. Tsuruta, K. Matsumoto, A. Ichinose, S. Awaji

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

We have fabricated 5.6 vol.% BaHfO3 (BHO)-doped SmBa2Cu3Oy (SmBCO) films at a low substrate temperature of 750�C by using the low temperature growth (LTG) technique with a seed layer. Using the LTG technique, we can obtain a purely c-axis oriented SmBCO film even at low growth temperatures. The LTG technique also greatly increases the number density of BHO nanorods. The size and matching field of the BHO nanorods in the films were 5.4 nm and 9.9 T. Transport measurements were carried out, and a high irreversibility field (B irr) and strong flux pinning force density (F p) were obtained. The B irr was 15.1 T at 77 K for B//c. The maximum F p of 407 GN m-3 in 10 T at 40 K and 770 GN m-3 from 9 to 17 T at 20 K have been measured. We believe that the LTG technique can be considered as important for improving of flux pinning performance in BaMO3 (BMO: M= Zr, Sn and Hf)-doped SmBCO coated conductors.

Original languageEnglish
Article number114006
JournalSuperconductor Science and Technology
Volume28
Issue number11
DOIs
Publication statusPublished - 2015 Oct 7

Keywords

  • BaHfO
  • SmBaCuO
  • flux pinning
  • thin film

ASJC Scopus subject areas

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

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