Developments of (Ba,Na)Fe2As2and CaKFe4As4HIP round wires

T. Tamegai, S. Pyon, D. Miyawaki, Y. Kobayashi, S. Awaji, H. Kito, S. Ishida, Y. Yoshida, K. Takano, H. Kajitani, N. Koizumi

研究成果: Article査読

抄録

With excellent superconducting properties such as high T c, large H c2, small anisotropy, and large J c, developments of superconducting wires and tapes of iron-based superconductors (IBSs) have been undertaken with promising results. So far, K-doped 122-type IBSs have been mainly developed for such purposes. Here, efforts to fabricate Na-doped 122-type IBS, (Ba,Na)Fe2As2, are presented. With the help of hot isostatic pressing (HIP) process, excellent J c characteristics of up to 44 kA cm-2 at 4.2 K under 100 kOe have been achieved. Detailed characterizations of (Ba,Na)Fe2As2 HIP round wire are presented. On the other hand, discoveries of new IBSs continue, with CaKFe4As4 as one of recent examples. CaKFe4As4 belongs to a new family of IBSs with 1144 structure, where Ca and K occupy the Ba site in BaFe2As2 alternately along the c-axis. Studies on CaKFe4As4 single crystals have demonstrated moderately large J c with peculiar anisotropic properties related to the presence of novel planar defects. We have also fabricated HIP round wires of CaKFe4As4, and reported their basic characterizations. Despite the instability of CaKFe4As4 at low temperatures, J c values at 4.2 K close to 100 kA cm-2 at self-field and 7.6 kA cm-2 at 100 kOe are achieved. Attempts to introduce defects into CaKFe4As4 single crystals, chemically by Co substitution and physically by proton irradiation, are attempted, and the effects are compared. Attempts to fabricate Co-doped CaKFe4As4 HIP round wires with limited success are also reported.

本文言語English
論文番号104001
ジャーナルSuperconductor Science and Technology
33
10
DOI
出版ステータスPublished - 2020 10

ASJC Scopus subject areas

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

フィンガープリント 「Developments of (Ba,Na)Fe<sub>2</sub>As<sub>2</sub>and CaKFe<sub>4</sub>As<sub>4</sub>HIP round wires」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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