Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Correlated Electrons: Other Materials
TT 31.4: Vortrag
Dienstag, 21. März 2017, 14:45–15:00, HSZ 103
Quantum Oscillations in CoSb3 — •Marcel Naumann1, Frank Arnold1, Flipo Sever1, Mirtha Pillaca Quispe2, Dan Sun1, Michael Baenitz1, Andreas Leithe-Jasper1, Helge Rosner1, Peter Gille2, and Elena Hassinger1,3 — 1Max-Planck-Institut Chemische Physik fester Stoffe, Dresden, Germany — 2Ludwig-Maximillians-Universität München, Germany — 3Technische Universität München, Garching, Germany
The material class of skutterudites is at the center of attention on the search for new thermoelectric materials. Additionally, they also host a variety of novel electronic properties, such as valence fluctuations and non-fermi liquid behaviour, which are widely studied in condensed matter physics. The skutterudite CoSb3, in particular, is a parent compound, whose doped and "filled" variants are studied in the aforementioned fields. It is characterised by two linearly dispersing bands, which anticross close to the Fermi level at the Γ-point, coexisting with a heavier electron band above the crossing.
Here we present a comprehensive experimental study of the bulk Fermi surface of CoSb3. By means of quantum oscillations, measured in magnetisation and angle-dependent electronic transport, information about topology, charge carrier effective mass and scattering times are gained. Two Fermi surfaces of similar size are observed. Their size and topology fit the charge carrier density determined by Hall measurements and ab-initio DFT calculations for slight electron doping. Furthermore, we show reproducible doping levels and crystal quality throughout a variety of sample batches.