Multipole Orders in a Chain Ferrate Na2FeSe

Abstract

Fundamental block and staggered orders of magnetic Fe multipoles in Na2FeSe2 are classified by their symmetry and magnetoelectric properties. Our structure model incorporates ferromagnetic or antiferromagnetic coupling between chains. The ferrate salt is valued in studies of highly correlated electrons as the only iron selenide known to possess chain-like structural units hosting ferrous cations. Axial and polar (Dirac) multipoles are compulsory in the electronic structure since Fe ions exhibit enantiomorphic symmetry in the parent K2ZnO2-type compound. Calculated Bragg diffraction patterns for neutrons and x-rays reveal specific contributions from both multipole types.

References in corpus (7)

• Gap symmetry and structure of Fe-based superconductors
• Low-energy microscopic models for iron-based superconductors: a review
• Block magnetic excitations in the orbitally selective Mott insulator BaFe2Se3
• Theory of neutron scattering by electrons in magnetic materials
• Ordered state of magnetic charge in the pseudo-gap phase of a cuprate superconductor (HgBa2CuO4)
• Prediction of exotic magnetic states in the alkali metal quasi-one-dimensional iron selenide compound Na${}_2$FeSe${}_2$
• Field-induced magnetic charge in a cubic Laves compound UAl2