Quantum transport evidence of Weyl fermions in an epitaxial ferromagnetic oxide

Kosuke Takiguchi, Yuki K. Wakabayashi (), Hiroshi Irie, Yoshiharu Krockenberger, Takuma Otsuka, Hiroshi Sawada, Sergey A. Nikolaev, Hena Das, Masaaki Tanaka, Yoshitaka Taniyasu and Hideki Yamamoto
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Kosuke Takiguchi: NTT Basic Research Laboratories, NTT Corporation
Yuki K. Wakabayashi: NTT Basic Research Laboratories, NTT Corporation
Hiroshi Irie: NTT Basic Research Laboratories, NTT Corporation
Yoshiharu Krockenberger: NTT Basic Research Laboratories, NTT Corporation
Takuma Otsuka: NTT Communication Science Laboratories, NTT Corporation
Hiroshi Sawada: NTT Communication Science Laboratories, NTT Corporation
Sergey A. Nikolaev: Laboratory for Materials and Structures, Tokyo Institute of Technology
Hena Das: Laboratory for Materials and Structures, Tokyo Institute of Technology
Masaaki Tanaka: The University of Tokyo
Yoshitaka Taniyasu: NTT Basic Research Laboratories, NTT Corporation
Hideki Yamamoto: NTT Basic Research Laboratories, NTT Corporation

Nature Communications, 2020, vol. 11, issue 1, 1-12

Abstract: Abstract Magnetic Weyl semimetals have novel transport phenomena related to pairs of Weyl nodes in the band structure. Although the existence of Weyl fermions is expected in various oxides, the evidence of Weyl fermions in oxide materials remains elusive. Here we show direct quantum transport evidence of Weyl fermions in an epitaxial 4d ferromagnetic oxide SrRuO3. We employ machine-learning-assisted molecular beam epitaxy to synthesize SrRuO3 films whose quality is sufficiently high to probe their intrinsic transport properties. Experimental observation of the five transport signatures of Weyl fermions—the linear positive magnetoresistance, chiral-anomaly-induced negative magnetoresistance, π phase shift in a quantum oscillation, light cyclotron mass, and high quantum mobility of about 10,000 cm2V−1s−1—combined with first-principles electronic structure calculations establishes SrRuO3 as a magnetic Weyl semimetal. We also clarify the disorder dependence of the transport of the Weyl fermions, which gives a clear guideline for accessing the topologically nontrivial transport phenomena.

Date: 2020
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DOI: 10.1038/s41467-020-18646-8

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