The effect of the Ag addition on FeSe superconducting wire by the ex-situ PIT method


Farisogullari D., Babij M., KARADAĞ F. , EKİCİBİL A. , Takano Y.

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume:
  • Publication Date: 2021
  • Doi Number: 10.1007/s10854-020-05041-8
  • Title of Journal : JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS

Abstract

We investigated the effect of an Ag addition to the FeSe0.94 superconducting wire. Production and characterization of the Ag-added FeSe0.94 superconducting wire were produced by the ex-situ PIT technique with an iron tube. The structural analysis (XRD and SEM) of the Ag-added FeSe0.94 wire indicate that it is mainly composed of the tetragonal phase (beta-FeSe) with a minor hexagonal (delta-FeSe) and cubic (alpha-Fe) secondary phases. The Ag spread inhomogeneous in the reacted layer, suggesting that it supports the intergrain connections. Moreover, a small amount of Ag entered into the crystal structure. The resistivity started to decrease at 10.5 K, and the zero-resistivity observed at 7.2 K was 0 T. The J(c) was calculated to be 80.7 A/cm(2) at 4.2 K in self-field. The presence of a non-superconducting binary phase of FeSe may behave as a pinning force promoting a larger critical current density. The upper critical field was estimated to be 66.3 T from linear exploration.