SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Correlated Electrons: Other Materials
TT 10.1: Vortrag
Montag, 27. März 2023, 15:00–15:15, HSZ 204
Towards a complete quantum oscillatory assessment of the Fermi surface of CoSi — •Nico Huber1, Simon Röder1, Georg Benka1, Andreas Bauer1, Sanu Mishra2,3, Ilya Sheikin2, Christian Pfleiderer1, and Marc A. Wilde1 — 1Physik-Department, TU Munich, D-85748 Garching, Germany — 2LNCMI-CNRS, Grenoble, France — 3Los Alamos National Laboratory, Los Alamos, USA
The B20 compound CoSi has recently attracted great interest due to its electronic structure hosting multifold fermions at the Γ- and R-point [1] and topologically non-trivial nodal planes on the Brillouin zone boundary [2,3]. While quantum oscillations (QOs) arising from the Fermi surface (FS) around the R-point have been studied in great detail and are well understood [3,4], only limited information has been presented on QOs related to the FS around the Γ-point [5]. Here, we report the experimental identification of previously unobserved QOs arising from heavy FS sheets around Γ in the Shubnikov-de Haas and de Haas-van Alphen spectra of CoSi. The oscillation frequencies, their angular dispersion, and the associated effective masses are in good agreement with first principle calculations. Our observations confirm the calculated bandstructure of CoSi, thus completing the experimental verification of the Fermi surface based on quantum oscillations.
[1] Rao et al., Nature 567, 496 (2019)
Sanchez et al., Nature 567, 500 (2019)
[2] Wilde et al., Nature 594, 374 (2021)
[3] Huber et al., PRL 129, 026401 (2022)
[4] Guo et al., Nat. Phys. 18, 813 (2022)
[5] Wang et al., PRB 102, 115129 (2020)
Sasmal et al., J. Phys.: Condens. Matter 34, 425702 (2022)