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Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Weyl Semimetals

MA 40.3: Vortrag

Freitag, 9. September 2022, 10:00–10:15, H48

Anomalous transport properties of the topological (Weyl) semimetal: Hexagonal - (Mn1−αFeα)3Ge — •Venus Rai1, Shibabrata Nandi1, Anne Stunault2, Wolfgang Schmidt3, Subhadip Jana1, Jian-Rui Soh4, Jörg Perßon1, and Thomas Brückel11Jülich 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 (Mn1−αFeα)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.

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