講演情報
[9a-E207-4]Experimental investigation of the third-order nonlinear anomalous Hall effect in ferromagnetic Weyl semimetal-based alloy films
〇(M1)Satoshi Kazami1,2, Jiahao Han1,3,4, Tomohiro Uchimura5, Kohei Fujiwara6, Kota Nihei1,2, Shun Kanai1,2,3,4,7,8, Atsushi Tsukazaki9,10, Shunsuke Fukami1,2,3,4,11,12 (1.RIEC, Tohoku Univ., 2.Grad. School of Eng., Tohoku Univ., 3.CSIS, Tohoku Univ., 4.AIMR, Tohoku Univ., 5.SRIS, Tohoku Univ., 6.Dept. of Chem., Rikkyo Univ., 7.DEFS, Tohoku Univ., 8.QST., 9.QPEC and Dept. of Appl. Phys., Univ. of Tokyo., 10.IMR, Tohoku Univ., 11.CIES, Tohoku Univ., 12.InaRIS.)
キーワード：
Nonlinear Hall effect、Weyl semimetal
Nonlinear Hall effect effectively probes the topologically non-trivial properties of electronic materials. The nonlinear order is generally determined by the geometric structure of Bloch electrons, following symmetry restrictions. In practice, clarifying the quantum-geometric origin of a nonlinear Hall effect is challenging as the nonlinear order goes high, due to the increasing number of competing mechanisms. Here we show a protocol of measuring and interpreting a third-order anomalous Hall effect (TAHE) in a ferromagnetic Weyl semimetal film, In-substituted Co3Sn2S2 (In-CSS). The third-order Hall voltage exhibits hysteresis loops following the first-order anomalous Hall effect. We subtract the thermal contribution from the measured third-order Hall voltage. Scaling analysis of the extracted TAHE signal allows us to identify its quantum-geometric origins. These results provide useful insights into higher-order transport in topological magnets.