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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 Schilberth1,2, Franz Mayr1, Joachim Deisenhofer1, Hiroyuki Nakamura3, Mohamed Kassem3, Sándor Bordács2, and István Kézsmárki1,2 — 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.