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MA: Fachverband Magnetismus

MA 40: Weyl Semimetals

MA 40.3: Talk

Friday, September 9, 2022, 10:00–10:15, H48

Anomalous transport properties of the topological (Weyl) semimetal: Hexagonal - (Mn_1−αFe_α)₃Ge — •Venus Rai¹, Shibabrata Nandi¹, Anne Stunault², Wolfgang Schmidt³, Subhadip Jana¹, Jian-Rui Soh⁴, Jörg Perßon¹, and Thomas Brückel¹ — ¹Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), JARA-FIT, Forschungszentrum Jülich, Germany — ²Institut Laue-Langevin, 71 avenue des Martyrs, CS20156, Grenoble, France — ³Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at ILL, 71 Avenue des Martyrs, Grenoble, France — ⁴Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

Weyl semimetal (WS) - Mn₃Ge displays a large anomalous Hall effect (AHE), which originates from the non-zero Berry curvature. The location and separation of the Weyl nodes can be tuned using a suitable dopant. So, we have studied the evolution of transport properties of single-crystal (Mn_1−αFe_α)₃Ge. We observed that the strength of AHE and chiral anomaly weakens drastically with an increase in Fe doping and vanishes beyond α = 0.22. Polarized and unpolarized neutron diffraction of α = 0.22 showed that the magnetic structure of the compound remains the same as that of the parent compound, only in the temperature regime where AHE and the chiral anomaly are observed. These observations suggest the location of Weyl points and separation between a pair of Weyl points change significantly with Fe doping. Therefore, suitable dopants can be used to tune the transport properties of the WS.