Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 13: Altermagnets II
MA 13.1: Vortrag
Dienstag, 18. März 2025, 09:30–09:45, H20
Dynamics of the altermagnetic candidate compound UCr2Si2C — Nikolaos Biniskos1, •Manuel dos Santos Dias2, Karin Schmalzl3, Andrea Piovano4, Ursula Bengaard Hansen4, Michal Valişka1, and Petr Çermák1 — 1Department of Condensed Matter Physics, Charles University, Praha, Czech Republic — 2Scientific Computing Department, STFC Daresbury Laboratory, United Kingdom — 3Jülich Centre for Neutron Science at ILL, Forschungszentrum Jülich, Grenoble, France — 4Institut Laue-Langevin, Grenoble, France
Altermagnets are collinear antiferromagnets where spin degeneracy of the electronic bands or degeneracy of the magnon bands is not enforced by symmetry, potentially enabling diverse physical phenomena.
However, it remains challenging to find materials that experimentally exhibit the hallmarks of altermagnetism.
UCr2Si2C has been recently reported as a high-temperature antiferromagnet with a rare crystal structure that is compatible with altermagnetism [1].
This talk will report on our combined experimental and theoretical investigation of this compound.
A large single crystal was successfully grown and experimentally investigated with bulk specific heat and magnetic susceptibility measurements, and through unpolarized and polarized inelastic neutron scattering.
These experimental results have been interpreted with density functional theory calculations, providing a unified picture of UCr2Si2C and of its prospects as an altermagnet.
[1] Lemoine et al., Inorg. Chem. 57, 2546-2557 (2018)
Keywords: altermagnet; phonons; density functional theory; neutron spectroscopy