Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Topological Semimetals I

TT 7.2: Vortrag

Montag, 12. März 2018, 09:45–10:00, A 053

Effects of pressure on the Fermi surface of Cd₃As₂ — •Aleksandar Vasiljković¹, Filip Orbanić², Mario Novak², Malte Grosche¹, and Ivan Kokanović^1,2 — ¹Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom — ²Department of Physics, Faculty of Science, University of Zagreb, 10002 Zagreb, Croatia

Cd₃As₂ is a symmetry-protected three dimensional Dirac semimetal with high carrier mobility [1], motivating detailed investigations of the electronic structure and its evolution with applied pressures. Shubnikov-de Haas oscillations have previously been reported with frequencies of around 55T, corresponding to tiny Fermi surface pockets in a semimetallic band structure [2]. De Haas-van Alphen oscillations have also been observed with slightly smaller frequencies [2]. We have examined the Shubnikov-de Haas oscillations of the magnetoresistance in a high-quality crystal grown under different conditions over a wide range of temperature and pressure. In contrast to previous reports, we observe a significantly lower quantum oscillation frequency of  27T at ambient pressure in a direction perpendicular to c direction, which decreases significantly with increasing pressure. We also saw 35T frequency at ambient pressure in c direction. The observed SdH oscillations allow us to characterize the Fermi surface by extracting its relevant parameters.
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