Block antiferromagnetism and possible ferroelectricity in KFe${}_2$Se${}_2$

Abstract

Superconductors and multiferroics are two of the hottest branches in condensed matter physics. The connections between those two fields are fundamentally meaningful to unify the physical rules of correlated electrons. Recently, BaFe${}_2$Se${}_3$, was predicted to be multiferroic [Phys. Rev. Lett. 113, 187204 (2014)] due to its unique one-dimensional block-type antiferromagnetism. Here, another iron-selenide KFe${}_2$Se${}_2$, a parent state of iron-based superconductor, is predicted to be multiferroic. Its two-dimensional block-type antiferromagnetism can generate a moderate electric dipole for each Fe-Se layer via the Fe-Se-Fe exchange striction. Different stacking configurations of these magnetic blocks give closely proximate energies and thus the ground state of KFe${}_2$Se${}_2$ may be switchable between antiferroelectric and ferroelectric phases.

arXiv comment5 pages, 4 figures

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Cited by in corpus (5)

• Sequential structural and antiferromagnetic transitions in BaFe${}_2$Se${}_3$ under pressure
• Pressure-driven phase transition from antiferromagnetic semiconductor to nonmagnetic metal in two-leg ladders $A$Fe${}_2$$X$${}_3$ ($A$=Ba or K, $X$=S or Se)
• Iron telluride ladder compounds: Predicting the structural and magnetic properties of BaFe${}_2$Te${}_3$
• Exchange striction driven magnetodielectric effect and potential photovoltaic effect in polar CaOFeS
• New iron-based multiferroics with improper ferroelectricity