Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 20: Topology: Poster Session
TT 20.8: Poster
Wednesday, September 7, 2022, 15:00–18:00, P1
Band structure and effective masses of the topological semimetal PdGa — •F. Husstedt1,2, B.V. Schwarze1,2, M. Uhlarz1, S. Chattopadhyay1, K. Manna3,4, S. Shekhar3, C. Felser3, 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 — 3Max Planck Institute for Chemical Physics of Solids, Germany — 4Indian Institute of Technology Delhi, India
De Haas-van Alphen (dHvA) measurements at low temperatures and fields up to 18 T provided insight into the band structure of the topological semimetal PdGa which is presented in this poster. Previous investigation of PtGa revealed the topological character [1] of this sister compound of PdGa. Hence, angle-resolved measurements of the dHvA effect were performed on PdGa and showed a good agreement with the calculated band structure. This revealed a multitude of Fermi surfaces and eight spin-splitted bands crossing the Fermi energy. In particular, the calculations show a similar band structure as for PtGa, including two topologically protected multifold degenerate band-touching nodes. Furthermore, we analyzed the temperature dependence of the dHvA oscillations to determine the effective masses for field aligned along the crystallographic [100] axis. The low masses also show a good agreement to the calculations and, therefore, indicate insignificant correlations of the electrons.
[1] M. Yao, K. Manna et al., Nat. Commun. 11, 2033 (2020).