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Nakatsuji, Satoru
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article
Temperature-induced anomalous magnetotransport in the Weyl semimetal Mn<sub>3</sub>Ge
Abstract
<jats:p> The magnetic Weyl semimetallic state can lead to intriguing magnetotransport, such as chiral anomaly and the layered quantum Hall effect. Mn<jats:sub>3</jats:sub>X (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 Mn<jats:sub>3</jats:sub>Sn, the Weyl fermion-induced magnetotransport in Mn<jats:sub>3</jats:sub>Ge has been merely studied. Here, we report an in-depth study on the magnetotransport in a microfabricated Mn<jats:sub>3</jats:sub>Ge 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. </jats:p>