Résumé : The iron-based superconductor YFe2Ge2 (Tc ~ 1.8 K)[1] has attracted interest due to strong electronic correlations[2] and shows enhanced magnetic fluctuations in neutron scattering[3]. Its isoelectronic and isostructural sister compound LuFe2Ge2 orders antiferromagnetically below TN ~ 6.8 K, and in clean crystals shows a resistive superconducting transition below 1 K. We present recent inelastic neutron scattering experiments on LuFe2Ge2 in the ordered and paramagnetic phases. The excitations are modelled with linear spin wave theory, and we note some similarities to previous results in paramagnetic YFe2Ge2.
[1] J. Chen et al., Phys. Rev. Lett. 125, 237002 (2020).
[2] J. Baglo et al. Phys. Rev. Lett. 129, 046402 (2022). B. Xu et al., Proc. Natl. Acad. Sci. U. S. A. 121, e2401430121 (2024).
[3] H. Wo et al., Phys. Rev. Lett. 122, 217003 (2019).
