Weyl points and anomalous transport effects tuned by the Fe doping in Mn${}_3$Ge Weyl semimetal

Abstract

The discovery of a significantly large anomalous Hall effect in the chiral antiferromagnetic system - Mn${}_3$Ge - indicates that the Weyl points are widely separated in phase space and positioned near the Fermi surface. In order to examine the effects of Fe substitution in Mn${}_3$Ge on the presence and location of the Weyl points, we synthesized (Mn${}_{1-\alpha }$Fe${}_{\alpha })$${}_3$Ge ($\alpha =0-0.30$) compounds. The anomalous Hall effect was observed in compounds up to $\alpha =0.22$, but only within the temperature range where the magnetic structure remains the same as the Mn${}_3$Ge. Additionally, positive longitudinal magnetoconductance and planar Hall effect were detected within the same temperature and doping range. These findings strongly suggest the existence of Weyl points in (Mn${}_{1-\alpha }$Fe${}_{\alpha })$${}_3$Ge ($\alpha =0-0.22$) compounds. Further, we observed that with an increase in Fe doping fraction, there is a significant reduction in the magnitude of anomalous Hall conductivity, planar Hall effect, and positive longitudinal magnetoconductance, indicating that the Weyl points move further away from the Fermi surface. Consequently, it can be concluded that suitable dopants in the parent Weyl semimetals have the potential to tune the properties of Weyl points and the resulting anomalous electrical transport effects.

arXiv commentAccepted in New Journal of Physics (03/2024)

References in corpus (38)

• Topological Insulators
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Antiferromagnetic spintronics
• Topological Insulator Materials
• Chiral Anomaly and Classical Negative Magnetoresistance of Weyl Metals
• Large anomalous Hall effect driven by non-vanishing Berry curvature in non-collinear antiferromagnetic Mn3Ge
• Anomalous Hall effect arising from noncollinear antiferromagnetism
• Large anomalous Nernst effect at room temperature in a chiral antiferromagnet
• Evidence for Magnetic Weyl Fermions in a Correlated Metal
• Anomalous Hall Effect in Weyl Metals
• Large magneto-optical Kerr effect and imaging of magnetic octupole domains in an antiferromagnetic metal
• Electrical Manipulation of a Topological Antiferromagnetic State
• Topological Weyl semimetals in the chiral antiferromagnetic materials Mn3Ge and Mn3Sn
• Giant Anomalous Hall Effect in the Chiral Antiferromagnet Mn3Ge
• Chiral anomaly as origin of planar Hall effect in Weyl semimetals
• Chiral Anomaly and Diffusive Magnetotransport in Weyl Metals
• Giant Planar Hall Effect in Topological Metals
• Anisotropic Magnetoresistance Effects in Fe, Co, Ni, Fe_4N, and Half-Metallic Ferromagnet: A Systematic Analysis
• Experimental tests of the chiral anomaly magnetoresistance in the Dirac-Weyl semimetals Na${}_3$Bi and GdPtBi
• An ideal Weyl semimetal induced by magnetic exchange
• Berry curvature unravelled by the Nernst effect in Mn${}_3$Ge
• Piezomagnetic switching of anomalous Hall effect in an antiferromagnet at room temperature
• Creating Weyl nodes and controlling their energy by magnetization rotation
• Z_2 and Chiral Anomalies in Topological Dirac Semimetals
• Intrinsic anomalous Hall effect in Ni-substituted magnetic Weyl semimetal Co3Sn2S2
• Weak localization and weak anti-localization in topological insulators
• Enhanced Anomalous Hall Effect in Magnetic Topological Semimetal Co${}_3$Sn${}_{2-x}$In${}_x$S${}_2$
• Ground state magnetic structure of Mn${}_3$Ge
• Antichiral spin order its Goldstone modes and their hybridization with phonons in the topological semimetal Mn3Ge
• Gradual pressure-induced change in the magnetic structure of the non-collinear antiferromagnet Mn${}_3$Ge
• Anomalous Hall Effect in three ferromagnets: EuFe4Sb12, Yb14MnSb11, and Eu8Ga16Ge30
• Pressure tuning of the anomalous Hall effect in the chiral antiferromagnet Mn3Ge
• Spin-dependent scattering induced negative magnetoresistance in topological insulator Bi2Te3 nanowires
• Tuning of topological properties in the strongly correlated antiferromagnet Mn${}_3$Sn via Fe doping
• Unconventional magneto-resistance, and electronic transition in Mn${}_3$Ge Weyl semimetal
• The evolution of Weyl nodes in Ni doped thallium niobate pyrochlore Tl${}_{2-x}$Ni${}_x$Nb${}_2$O${}_7$
• Anomalous Hall effect and magnetic structure of the topological semimetal (Mn${}_{0.78}$Fe${}_{0.22}$)${}_3$Ge
• Tuning of Electrical, Magnetic, and Topological Properties of Magnetic Weyl Semimetal Mn${}_{3+x}$Ge by Fe doping

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