Electronic and Magnetic Structures of Chain Structured Iron Selenide Compounds

Abstract

Electronic and magnetic structures of iron selenide compounds Ce2O2FeSe2 (2212\ast) and BaFe2Se3(123\ast) are studied by the first-principles calculations. We find that while all these compounds are composed of one-dimensional (1D) Fe chain (or ladder) structures, their electronic structures are not close to be quasi-1D. The magnetic exchange couplings between two nearest-neighbor (NN) chains in 2212\ast and between two NN two-leg-ladders in 123\ast are both antiferromagnetic (AFM), which is consistent with the presence of significant third NN AFM coupling, a common feature shared in other iron-chalcogenides, FeTe (11\ast) and KyFe2-xSe2 (122\ast). In magnetic ground states, each Fe chain of 2212\ast is ferromagnetic and each two-leg ladder of 123\ast form a block-AFM structure. We suggest that all magnetic structures in iron-selenide compounds can be unified into an extended J1-J2-J3 model. Spin-wave excitations of the model are calculated and can be tested by future experiments on these two systems.

6 pages, 6 figures, 2 tables

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• First-principles study of magnetic properties in Fe-ladder compound BaFe2S3
• The magnetic and electronic properties of Oxyselenides - influence of transition metal ions and lanthanides
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• Synthesis, Structural, and Transport Properties of Cr-doped BaTi_2As_2O
• Small influence of magnetic ordering on lattice dynamics in TaFe${}_{1.25}$Te${}_3$