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MA: Fachverband Magnetismus

MA 9: Weyl Semimetals

MA 9.6: Vortrag

Montag, 16. März 2020, 12:45–13:00, POT 6

Infrared spectroscopy on the magnetic Weyl-semimetal Co₃Sn₂S₂ — •Felix Schilberth^1,2, Franz Mayr¹, Joachim Deisenhofer¹, Hiroyuki Nakamura³, Mohamed Kassem³, Sándor Bordács², and István Kézsmárki^1,2 — ¹Chair for Experimental Physics V, University of Augsburg, 86159 Augsburg, Germany — ²Department of Physics, Budapest University of Technology and Economics, 1111 Budapest, Hungary — ³Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan

We investigate the shandite Co₃Sn₂S₂, a ferromagnet with kagome lattice and a magnetic ordering temperature of 174 K. According to recent angle resolved photoemission spectroscopy (ARPES) studies, the bulk band structure of this material hosts Weyl-nodes and correspondingly the surface states form so-called Fermi arcs. Since the Fermi-Energy lies in the vicinity of the Weyl-nodes, large anomalous Hall-effect (AHE) was detected in Co₃Sn₂S₂. Here, we use infrared spectroscopy to uncover the low-energy electronic excitations of this compound. Regarding the kagome plane, our data reflects the anisotropy of the crystal structure for polarisations in- and out-of-plane. For both polarisations, the magnetic ordering causes a reconstruction of the electronic states in the vicinity of the Fermi-Energy. In addition, we investigate the spin dependent properties of the bands using magneto-optical Kerr-effect (MOKE) spectroscopy in the infrared-visible energy range. From these experiments, we determine both the diagonal and the off-diagonal parts of the conductivity tensor which allow us to identify the key features of the band structure responsible for the large AHE.