[22a-P01-1~38] 10 Spintronics and Magnetics (Poster)

English Presentation

[22a-P01-11] Scattering-dependent transport of SrRuO₃ films: From Weyl fermion transport to hump-like Hall effect anomaly

〇(D)Shingo Kaneta^1,2, Yuki K. Wakabayashi², Yoshiharu Krockenberger², Hiroshi Irie², Shinobu Ohya^1,3, Masaaki Tanaka^1,3, Yoshitaka Taniyasu², Hideki Yamamoto² (1.The Univ. of Tokyo, 2.NTT-BRL, 3.CSRN, The Univ. of Tokyo)

Keywords:

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 SrRu_0.7O₃ 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 SrRu_0.7O₃. These results serve as a guideline for the development of SrRu_1-xO₃-based spintronics and topological electronics.