Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Weyl Semimetals

MA 40.2: Talk

Friday, September 9, 2022, 09:45–10:00, H48

Magnetic and transport properties of Mn₃Sn and Fe doped Mn₃Sn Weyl semimetal — •SUBHADIP JANA — Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), JARA-FIT, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany

A large Anomalous Hall Effect (AHE) has been found in Mn₃Sn due to the non-vanishing Berry flux emerging from the Weyl points. This compound draws enormous interest due to the complicated magnetic structure and its correlation with the transport properties. We observed AHE from 420 K (T_N = 420 K) down to 5 K for Mn_3.17Sn. From single-crystal neutron diffraction, we conclude that the magnetic structure is commensurate with magnetic moments in the hexagonal basal plane between 420 K (T_N) < T < 5 K. An additional incommensurate phase appears below 250 K. The presence of AHE in the whole temperature range is consistent with the commensurate magnetic structure. Fe doping influences the nearest-neighbor exchange energy, thereby changing the magnetic and transport properties. The Néel temperature was found to be 405 K for Mn_3.02Fe_0.08Sn, slightly lower than the parent compound. The commensurate magnetic structure has been observed between 210 K < T < 405 K from neutron powder diffraction. An incommensurate magnetic phase was observed below 210 K. The electro-transport study of Fe-doped sample shows vanishing AHE below 207 K. Therefore, we conclude that Fe doping significantly influences the magnetic structure in the commensurate region and that AHE completely vanishes in the incommensurate region.