2022年第69回応用物理学会春季学術講演会

講演情報

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 » 10.1 新物質・新機能創成(作製・評価技術)

[22p-E205-1~16] 10.1 新物質・新機能創成(作製・評価技術)

2022年3月22日(火) 13:45 〜 18:15 E205 (E205)

大矢 忍(東大)、関 宗俊(東大)、松野 丈夫(阪大)

13:45 〜 14:00

[22p-E205-1] [The 51st Young Scientist Presentation Award Speech] Quantum limit transport and Two-dimensional Weyl fermions in epitaxial ferromagnetic oxide SrRuO3 thin films

〇Shingo Kaneta1,2、Yuki. K Wakabayashi1、Yoshiharu Krockenberger1、Toshihiro Nomura3、Yoshimitsu Kohama3、Hiroshi Irie1、Kosuke Takiguchi2、Shinobu Ohya2,4,5、Masaaki Tanaka2,5、Yoshitaka Taniyasu1、Hideki Yamamoto1 (1.NTT-BRL、2.Univ. of Tokyo、3.ISSP, Univ. of Tokyo、4.IEI, Univ. of Tokyo、5.CSRN, Univ. of Tokyo)

キーワード:Weyl fermion, two-dimensional transport, quantum limit transport

High-mobility two-dimensional carriers originating from pairs of Weyl nodes in magnetic Weyl semimetals are highly desired for their topological and spin electronics applications. The two-dimensional carriers in topological semimetals are realized due to surface Fermi arcs.
In this presentation, we report thickness- and angle-dependent magnetotransport properties, including quantum oscillations, of magnetic Weyl semimetal SrRuO3. The quantum oscillations for the 10-nm SrRuO3 film show that the high-mobility two-dimensional carriers originate from surface Fermi arcs. When a magnetic field was applied parallel to the current, the negative magnetoresistance (MR) saturated in the quantum limit, confirming that the negative MR is induced by the chiral anomaly of Weyl nodes. These findings further highlight SrRuO3 as an intriguing platform for topological oxide electronics and for exploring exotic quantum transport phenomena in magnetic Weyl semimetals.