Unusual Multiple Magnetic Transitions and Anomalous Hall Effect Observed in Antiferromagnetic Weyl Semimetal, Mn$_{2.94}$Ge (Ge-rich)

We report on the magnetic and Hall effect measurements of the magnetic Weyl semimetal, Mn $_{2.94}$ Ge (Ge-rich) single crystal. From the magnetic properties study, we identify unusual multiple magnetic transitions below the N $\overset{ˊ}{e}$ el temperature of 353 K, such as the spin-reorientation ( $T_{S R}$ ) and ferromagnetic-like transitions. Consistent with the magnetic properties, the Hall effect study shows unusual behavior around the spin-reorientation transition. Specifically, the anomalous Hall conductivity (AHC) increases with increasing temperature, reaching a maximum at $T_{S R}$ , which then gradually decreases with increasing temperature. This observation is quite in contrast to the Mn $_{3 + δ}$ Ge (Mn-rich) system, though both compositions share the same hexagonal crystal symmetry. This study unravels the sensitivity of magnetic and topological properties on the Mn concentration.

Unusual Multiple Magnetic Transitions and Anomalous Hall Effect Observed in Antiferromagnetic Weyl Semimetal, Mn $_{2.94}$ Ge (Ge-rich)

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Unusual Multiple Magnetic Transitions and Anomalous Hall Effect Observed in Antiferromagnetic Weyl Semimetal, Mn $_{2.94}$ Ge (Ge-rich)

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Unusual Multiple Magnetic Transitions and Anomalous Hall Effect Observed in Antiferromagnetic Weyl Semimetal, Mn2.942.94​Ge (Ge-rich)

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Unusual Multiple Magnetic Transitions and Anomalous Hall Effect Observed in Antiferromagnetic Weyl Semimetal, Mn2.942.94​Ge (Ge-rich)

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Unusual Multiple Magnetic Transitions and Anomalous Hall Effect Observed in Antiferromagnetic Weyl Semimetal, Mn $_{2.94}$ Ge (Ge-rich)

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Unusual Multiple Magnetic Transitions and Anomalous Hall Effect Observed in Antiferromagnetic Weyl Semimetal, Mn $_{2.94}$ Ge (Ge-rich)

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