[19p-143-1~13] 11.1 Fundamental properties

[19p-143-13] Critical current properties and Vortex pinning mechanism in Iron-based superconductor CaKFe₄As₄ single crystals

〇Shigeyuki Ishida¹, Akira Iyo¹, Hiraku Ogino¹, Hiroshi Eisaki¹, Nao Takeshita¹, Kenji Kawashima², Keiichi Yanagisawa³, Yuuga Kobayashi³, Koji Kimoto³, Hideki Abe³, Motoharu Imai³, Jun-ichi Shimoyama⁴, Michael Eisterer⁵ (1.AIST, 2.IMRA Material R&D Co., Ltd., 3.NIMS, 4.Aoyama Gakuin Univ., 5.TU Wien)

Keywords:superconductivity, critical current properties, iron-based superconductors

1144-type iron-based superconductor CaKFe₄As₄ possesses a crystal structure where Ca and K do not occupy an equivalent site and the Ca and K layers are inserted altenately along the c-axis direction. The superconducting transition temperature (T_c ~ 35 K), the upper critical field (H_c2 ~ 100 T), and the anisotropy parameter (γ ~ 1-2) are comparable with those for AE_1-xA_xFe₂As₂ (122 type), suggesting the high application potential of 1144 materials. In this study, we will report the critical current properties of CaKFe₄As₄ single crystals.