journal article·2023-04-01Open access

Temperature-induced anomalous magnetotransport in the Weyl semimetal Mn3Ge

Mingxing Wu, Kouta Kondou, Taishi Chen, Satoru Nakatsuji, Yoshichika Otani

AIP Advances· Volume 13· Issue 4

Abstract

The magnetic Weyl semimetallic state can lead to intriguing magnetotransport, such as chiral anomaly and the layered quantum Hall effect. Mn3X (X = Sn, Ge) is a noncollinear antiferromagnetic semimetal where a Weyl semimetallic state is stabilized by time-reversal symmetry breaking. Compared to the well-studied Mn3Sn, the Weyl fermion-induced magnetotransport in Mn3Ge has been merely studied. Here, we report an in-depth study on the magnetotransport in a microfabricated Mn3Ge single crystal from room temperature to 10 K. We reveal an anomalous anisotropic magnetoresistance with fourfold symmetry and a positive high-field longitudinal magnetoresistance below the critical temperature (160–170 K). The possible origin is the temperature-induced tilting of the Weyl nodes. Our study helps to understand the magnetotransport properties in the Weyl fermion system.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Advanced Condensed Matter Physics · Multiferroics and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

The Institute for Solid State Physics, The University of Tokyo 1 , Kashiwa, Chiba 277-8581, Japan

RIKEN, Center for Emergent Matter Science 2 , 2-1 Hirosawa, Wako 351-0198, Japan

CREST, Japan Science and Technology Agency (JST) 3 , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan

School of Physics, Southeast University 4 , Nanjing 211189, China

Department of Physics, University of Tokyo 5 , Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Trans-scale Quantum Science Institute, University of Tokyo 6 , Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Canadian Institute for Advanced Research 7 , Toronto, Ontario M5G 1M1, Canada

Funding

Core Research for Evolutional Science and Technology · JST-Mirai Program · Japan Society for the Promotion of Science

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