Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Topological Semimetals I
TT 38.2: Vortrag
Mittwoch, 20. März 2024, 09:45–10:00, H 3010
Negative magnetoresistance in the Weyl semimetal TaRhTe4 — •Mahdi Behnami1, Helena Reichlova1,2,3, Saicharan Aswartham1, Grigory Shipunov1, Dmitriy Efremov1, Vilmos Kocsis1, Marina Putti4,5, Federico Caglieris1,4, and Bernd Büchner1,2 — 1IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — 2Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany — 3Institute of Physics ASCR, v.v.i., Cukrovarnick a 10, 162 53, Praha 6, Czech Republic — 4CNR-SPIN, 16152 Genova, Italy — 5Department of Physics, University of Genoa, 16146 Genova, Italy
TaRhTe4 is a type-II Weyl semimetal, hosting minimal Weyl points in close proximity to the Fermi level [1]. One of the most intriguing transport phenomena associated with Weyl physics is the chiral anomaly-induced negative magneto-resistance observed when magnetic and electric fields are parallel [2]. In this study, we employ a systematic measurement approach, measuring magnetoresistance along various crystallographic directions. We observe a negative sign, considered a signature of the chiral anomaly, but notably, this effect is present only along certain directions. Furthermore, this negative magneto-resistance persists up to room temperature, suggesting that TaRhTe4 possesses unique properties within the emerging family of Weyl semimetals.
[1] G. Shipunov et al., J. Phys. Chem. Lett. 12, 28 (2021) 6730
[2] A. Niemann et al., Sci Rep 7 (2017) 43394
Keywords: Chiral anomaly; Negative Magnetoresistance; Weyl semimetals; TaRhTe4; Fermi level