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MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.50: Poster
Montag, 9. März 2026, 09:30–12:30, P2
Mössbauer Spectroscopy on the Candidate Altermagnet Material FeNb4S8 — •Jan Friedrichsen1, Felix Seewald1, Lilian Prodan2, Joachim Deisenhofer2, István Kézsmárki2, and Hans-Henning Klauss1 — 1Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 2Experimental Physics V, Institute of Physics, University of Augsburg, Augsburg, Germany
FeNb4S8 is a proposed altermagnet and a member of the layered intercalated transition metal dichalcogenides. The crystal structure consists of stacked layers of NbSe2, with sandwich layers of intercalated Fe atoms in hexagonal order[1]. Magnetic order is reported below the transition temperature TC=150 K.[2]
Mössbauer spectra at room temperature show the presence of a finite electric field gradient (EFG) of Vzz = −6.50(74) V/Å2. At 4.2 K however the absolute value of the electric field gradient is considerably larger with a value of Vzz = −66.45(13) V/Å2. Mössbauer data proof predominantly colinear arrangement of the local iron spins along the c-axis and is consistend with the proposed altermagnetic state. First measurements indicate a strong magnetostriction as a likely source of the strong temperature dependence of Vzz. The hyperfine field that is reached at 4.2K is 15.52(14) T. We will discuss the implications of the mössbauer results on the electronic and magnetic structure and dynamics.
[1]Regmi, Resham Babu, et al. "Altermagnetism in the layered intercalated transition metal dichalcogenide CoNb4Se8.".
[2]Lawrence, Erick A., et al. "Fe site order and magnetic properties of Fe1/4NbS2."
Keywords: Altermagnetism; Mössbauer spectroscopy