2021年第82回応用物理学会秋季学術講演会

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一般セッション(口頭講演)

10 スピントロニクス・マグネティクス » 10.4 半導体スピントロニクス・超伝導・強相関

[12a-S302-8~11] 10.4 半導体スピントロニクス・超伝導・強相関

2021年9月12日(日) 11:00 〜 12:00 S302 (口頭)

レ デゥック アイン(東大)

11:15 〜 11:30

[12a-S302-9] Measurement of the upper critical field of possible Ising-type topological superconductor FeTe0.6Se0.4 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.)

キーワード: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 FeTe0.6Se0.4 (FTS) equipping PMA electrodes with [Pt/Co] multilayer. As a consecutive study, we present the measurement of Hc2 of the FTS. The anisotropy of Hc2 of FTS was observed, where the aisotropy of Hc2 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.