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MA: Fachverband Magnetismus

MA 54: Altermagnets VI

MA 54.7: Vortrag

Freitag, 13. März 2026, 11:15–11:30, HSZ/0002

Spin Orbit Coupling Affecting the Presence of Altermagnetism in La₂O₂TM₂OSe₂, TM={Fe, Mn, Fe_0.5Mn_0.5} — •Tillmann Weinhold¹, Cornelius Herrmann¹, Domenic Nowak², Rowena Wachtel², Felix Seewald¹, Rajib Sarkar¹, Sabine Wurmehl², and Hans-Henning Klauß¹ — ¹Institute of Solid State and Materials Physics, IFMP, TUD Dresden University of Technology — ²Leibniz Institute for Solid State and Materials Research, IFW, Dresden

Altermagnets are a recently discovered type of solid with magnetic order leading to zero net magnetization while providing spin-splitting effects of electron bands of up to multiple eV.

While hundreds of possible candidates have been found by analyzing proposed crystal and magentic structures, only few of them could be experimentally proven to be altermagnets by now.

By the use of local probe techniques we were able to precisely determine the magnetic structure of La₂O₂Fe₂OSe₂, a compound isostructural to two proposed altermagnets, namely La₂O₂FeMnOSe₂ and La₂O₂Mn₂OSe₂.

A comparison of these conclusions with upcoming results of the other two compounds can give strong indications or possibly even experimental verification of whether the magnetic phase of these materials is altermagnetic.

Keywords: Nuclear Magnetic Resonance NMR; La2O2Fe2OSe2; La2O3Fe2Se2; Moessbauer Spectroscopy MBS