[9p-PA2-1~51] 11 Superconductivity (Poster)

[9p-PA2-9] Transport critical currents in microfabricated CaKFe₄As₄ devices

〇Hisashi Inoue¹, Shigeyuki Ishida¹, Yoichi Higashi¹, Akira Iyo¹, Hiroshi Eisaki¹, Hiraku Ogino¹ (1.AIST)

Keywords:

iron pnictide superconductors,critical current

In this study, we fabricated microdevices of the iron-based superconductor CaKFe₄As₄ by exfoliating and microfabricating single crystals, and directly evaluated their critical-current properties. Pulsed-current measurements of the self-field critical current revealed critical current densities on the order of 10⁶ ~ 10⁷ A/cm² near T_c. These results provide a basis for clarifying the physical origin of the critical current through future measurements at lower temperatures and under applied magnetic fields.