SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Poster Session: Topology
TT 59.8: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG4
Fermi-surface investigation of CaCdGe and CaCdSn — •B.V. Schwarze1,2, F. Husstedt1,2, M. Uhlarz1, D. Kaczorowski3, and J. Wosnitza1,2 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence-ct.qmat, HZDR, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Poland
CaCdSn and CaCdGe are nodal-line semimetal candidate materials. These materials have one-dimensional lines or loops of topologically protected band-touching nodes. They sparked interest, due to their unique response to high magnetic or electric fields, including giant linear magnetoresistance and high charge-carrier mobility. These properties make them candidates for future technological applications. Band-structure calculations [1, 2] show for both systems non-topological and topological valence bands with the nodal band crossings above the Fermi level. Previous measurements of the magnetoresistance provide some support for the topological nature of the materials. Here, we present our investigation of the Fermi surfaces of CaCdSn and CaCdGe by use of de Haas-van Alphen measurements and band-structure calculations. Our measurements reveal many quantum-oscillation frequencies, which are not predicted by calculations. This discrepancy calls the calculated band structures [1, 2] and, thus, the precise nature of the topology of these systems into question.
[1] A. Laha et al., Phys. Rev. B 102, 035164 (2020).
[2] E. Emmanouilidou et al., Phys. Rev. B 95, 245113 (2017).