Synthesis of $c$-axis textured CaKFe$_4$As$_4$ superconducting bulk via spark plasma texturing technique

Shigeyuki Ishida; Yoshihisa Kamiya; Yoshinori Tsuchiya; Pavan Kumar Naik Sugali; Yasunori Mawatari; Akira Iyo; Yoshiyuki Yoshida; Hiroshi Eisaki; Kenji Kawashima; Hiraku Ogino

doi:10.1016/j.jallcom.2023.171093

paper

Synthesis of $c$ -axis textured CaKFe $_{4}$ As $_{4}$ superconducting bulk via spark plasma texturing technique

arXiv:2403.19984 · doi:10.1016/j.jallcom.2023.171093

Abstract

Grain alignment is a key factor that determines the performance of a superconducting bulk. In this study, the spark plasma texturing (SPT) technique was used to fabricate a CaKFe $_{4}$ As $_{4}$ superconducting bulk. X-ray diffraction and electron backscatter diffraction revealed that the $c$ -axes of the CaKFe $_{4}$ As $_{4}$ grains in the SPT bulk are aligned, demonstrating that the SPT technique is effective in achieving $c$ -axis texture. In addition, chemical composition analysis showed that oxide impurities, which affect the grain boundary characteristics that determine the inter-grain critical current density ( $J_{c}$ ), are randomly distributed in the SPT bulk. Magnetization measurements showed high $J_{c}$ values of the SPT bulk, reaching 127 kA cm $^{- 2}$ and 26 kA cm $^{- 2}$ at 4.2 K under a self-field and magnetic field of 5 T, respectively. These results suggest that the SPT technique is a promising approach for obtaining a high-performance superconducting bulk material for high-field applications.

Synthesis of $c$ -axis textured CaKFe $_{4}$ As $_{4}$ superconducting bulk via spark plasma texturing technique

Abstract

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Synthesis of c-axis textured CaKFe4​As4​ superconducting bulk via spark plasma texturing technique

Abstract

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Synthesis of $c$ -axis textured CaKFe $_{4}$ As $_{4}$ superconducting bulk via spark plasma texturing technique