SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 59: Poster Session: Topology

TT 59.11: Poster

Donnerstag, 30. März 2023, 15:00–18:00, P2/OG4

Anomalous transverse transport and phase transitions in Weyl semimetals RAlSi (R = La, Ce) — •erjian cheng — Leibniz Institute for Solid State and Materials Research (IFW-Dresden), 01069 Dresden, Germany

The noncentrosymmetric RAlPn (R = rare earth elements, Pn = Si or Ge) with the space-inversion (SI) symmetry breaking and/or the time-reversal (TR) symmetry breaking host multiple types of Weyl fermions, providing a fertile platform for the exploration of novel topological matter states. In particular, when magnetic configuration couples with the electronic wavefunctions, exotic anomalous transverse transport phenomena emerge. Here, by resorting to electrical and thermoelectrical transport, we systematically studied the ferromagnetic CeAlSi and its nonmagnetic analog LaAlSi, revealing the anomalous Hall effect (AHE) and/or anomalous Nernst effect (ANE). In addition, for LaAlSi, quantum oscillations reveal five frequencies. Moreover, a temperature-induced Lifshitz transition is unveiled in LaAlSi. For CeAlSi, magnetism enhances the anomalous transverse transport, implying that magnetism tunes the positions of Weyl nodes. Besides, high-pressure electrical transport and X-ray diffraction (XRD) measurements were also implemented, demonstrating multiple phase transitions. These results indicate that LaAlSi and CeAlSi provide unique and tunable systems to explore exotic topological physics, and a potential paradise for an array of promising applications for spintronics.