[12a-S302-8~11] 10.4 Semiconductor spintronics, superconductor, multiferroics

▼ [12a-S302-9] Measurement of the upper critical field of possible Ising-type topological superconductor FeTe_0.6Se_0.4 with PMA electrodes

〇(M1)Kosuke Ohnishi¹, Sachin Gupta³, Ei Shigematsu¹, Ryo Ohshima¹, Yuichiro Ando¹, Masashi Shiraishi¹, Shigeru Kasahara⁴, Yuichi Kasahara², Yuji Matsuda² (1.Grad. Sch. of Eng., Kyoto Univ., 2.Grad. Sch. of Sci., Kyoto Univ., 3.Univ. Leeds, 4.Res. Inst. for Sci., Okayama Univ.)

Keywords:superconductor, FeTeSe, Ising-type superconductor

FeTeSe is a family of Fe-based superconductor. This material allows Ising-type superconductivity, which possesses spin polarization perpendicular to the plain at the surface. In addition, FeTeSe can be a great candidate for topological superconductor which can arise the S=1 spin-triplet Cooper pairs at the surface.To detect possible perpendicular spin-triplet states in FeTeSe electrically, ferromagnetic electrodes with perpendicular magnetic anisotropy (PMA) is necessary. In our previous presentation, we showed robust superconductivity of FeTe_0.6Se_0.4 (FTS) equipping PMA electrodes with [Pt/Co] multilayer. As a consecutive study, we present the measurement of H_c2 of the FTS. The anisotropy of H_c2 of FTS was observed, where the aisotropy of H_c2 of Ising-type superconductor was reported in previous study. Therefore, FTS can possess the Ising-type superconductivity even employing PMA electrodes. Detailed discussion will be given in the presentation.