Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 57: Topological Semimetals III
TT 57.4: Talk
Wednesday, March 14, 2018, 10:45–11:00, A 053
Exploring the Quantum Limit of Weyl semimetal candidates — •Tobias Förster1, Johannes Klotz1,2, Jochen Wosnitza1,2, Chandra Shekhar3, Binghai Yan3, and Claudia Felser3 — 1Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3Max Planck Institute f. Chemical Physics of Solids, Germany
Non-centrosymmetric transition-metal mono-pnictides such as NbAs, NbP and TaAs attracted a lot of attention because their bandstructures show linear non-degenerate band crossings, dubbed Weyl nodes [1,2]. Additionally, for certain magnetic-field orientations, the highest de Haas-van Alphen frequencies observed are smaller than 50 T. For that reason, all bands are expected to be in the quantum limit at fields easily reachable by pulsed magnetic fields. Thus, these semimetals constitute an ideal playground to study the quantum limit by electric transport and magnetic-torque measurements. Our first results for NbP show an unexpected linear increase in magnetic-torque measurements. In our contribution we show the results of our magnetic-torque measurements on NbP, NbAs, TaP and TaAs in pulsed fields up to 70 T.
[1] J. Klotz et al., Phys. Rev. B. 93 121105 (2016).
[2] C. Shekhar et al., Nat. Phys. 11 645 (2015).