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The discovery of superconductivity in the 122 iron selenide materials above30 K necessitates an understanding of the underlying magnetic interactions. Wepresent a combined experimental and theoretical investigation of magnetic andsemiconducting Ce$_{2}$O$_{2}$FeSe$_{2}$ composed of chains of edge-linked ironselenide tetrahedra. The combined neutron diffraction and inelastic scatteringstudy and density functional calculations confirm the ferromagnetic nature ofnearest-neighbour Fe -- Se -- Fe interactions in the ZrCuSiAs-related ironoxyselenide Ce$_{2}$O$_{2}$FeSe$_{2}$. Inelastic measurements provide anestimate of the strength of nearest-neighbor Fe -- Fe and Fe -- Ceinteractions. These are consistent with density functional theory calculations,which reveal that correlations in the Fe--Se sheets ofCe$_{2}$O$_{2}$FeSe$_{2}$ are weak. The Fe on-site repulsion $U_{Fe}$ iscomparable to that reported for oxyarsenides and K$_{1-x}$Fe$_{2-y}$Se$_{2}$,which are parents to iron-based superconductors.

physical review. b, condensed matter and materials physics

Magnetism of the Fe$^{2+}$ and Ce$^{3+}$ sublattices in  Ce$_{2}$O$_{2}$FeSe$_{2}$: a combined neutron powder diffraction, inelastic  neutron scattering and density functional study