Investigation of the magnetic Weyl semimetal candidate Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub> by ARPES.
ORAL
Abstract
Topological phases in magnetic materials are a topic of current interest in the community. Recently, the kagome-lattice ferromagnet Co3Sn2S2 was predicted to be a Weyl semimetal, while transport showed an exceptionally large anomalous Hall angle. Motivated by these exciting results, we use synchrotron ARPES to study single crystal Co3Sn2S2. We observe a strong photon energy dependence consistent with out-of-plane kz dispersion, even at moderate VUV photon energies. We compare our ARPES results with DFT and find a general match, with typical disagreement of ~ 0.1 eV. To address this disagreement, we perform muon/neutron scattering on Co3Sn2S2 to better understand the magnetic state experimentally. We comment on progress using our muon/neutron results to match DFT to ARPES and evaluating possible changes in the predicted Weyl phase and other topological indices. Our results suggest that the search for topological magnets might benefit from an iterative approach building on muon/neutron measurements of the magnetic state, DFT and ARPES.
*Work at Princeton was supported by the US DOE under the Basic Energy Sciences programme (Grant #: DOE/BES DE-FG-02-05ER46200) and the Gordon and Betty Moore Foundation (GBMF4547/Hasan).
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Presenters
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Ilya Belopolski
- Princeton University