Electric and magnetic properties of the unconventional insulator FeSb2

Condensed Matter and Materials Physics

  • Date: Jan 31, 2023
  • Time: 11:00 AM - 01:00 PM (Local Time Germany)
  • Speaker: Alex Eaton
  • Cavendish Laboratory, University of Cambridge, UK
  • Location: MPI CPfS
  • Room: Seminar rooms 1-2 hybrid
  • Host: Max-Planck-Institut für Chemische Physik fester Stoffe
Electric and magnetic properties of the unconventional insulator FeSb<sub>2</sub>
This talk shall examine anomalous insulating and metallic signatures of FeSb2. In our electrical transport measurements, we observe clear signatures of a metallic surface state at low temperatures. This offers a promising setting to explore the effects of strongly correlated 2D physics. Furthermore, despite being a bulk electrical insulator, we detect quantum oscillations in the bulk magnetisation under high applied magnetic fields, similar to previous observations in the analogous materials SmB6 and YbB12. Importantly, unlike in those materials we also uncover a strong connection between the unconventional insulating quantum oscillations in FeSb2 and features in the background magnetisation. Our results point strongly to a magnetic origin for the phenomenon of insulating quantum oscillations in unconventional insulators.
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