講演情報
[22a-P01-11]Scattering-dependent transport of SrRuO3 films: From Weyl fermion transport to hump-like Hall effect anomaly
〇(D)Shingo Kaneta1,2, Yuki K. Wakabayashi2, Yoshiharu Krockenberger2, Hiroshi Irie2, Shinobu Ohya1,3, Masaaki Tanaka1,3, Yoshitaka Taniyasu2, Hideki Yamamoto2 (1.The Univ. of Tokyo, 2.NTT-BRL, 3.CSRN, The Univ. of Tokyo)
キーワード：
Perovskite oxide、Weyl fermion、Topological Hall effect
The perovskite SrRuO3 has attracted intense interest after observations of Weyl fermions and hump-like Hall effect anomaly, so called the topological Hall effect. However, the origins of the anomaly are still controversial. In this presentation, we report magnetotransport properties in stoichiometric SrRuO3 and Ru-deficient SrRu0.7O3 films under various conditions to comprehensively understand the above magnetotransport properties. To investigate the origin of the anomalous Hall effect (AHE), we examined the scaling law of the AHE incorporating the Karplus-Luttinger and side-jump mechanisms. While this scaling law can be applied broadly to most of the films, we found it not the case for those exhibiting the anomaly, indicating that this anomaly does not have a topological origin. We also provide defect- and temperature-dependent transport diagrams for SrRuO3 and SrRu0.7O3. These results serve as a guideline for the development of SrRu1-xO3-based spintronics and topological electronics.