Reference : Unveiling the Room-Temperature Magnetoelectricity of Troilite FeS
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Unveiling the Room-Temperature Magnetoelectricity of Troilite FeS
Ricci, Fabio mailto [Université de Liège > Département de physique > Physique théorique des matériaux >]
Bousquet, Eric mailto [Université de Liège > Département de physique > Physique théorique des matériaux >]
Physical Review Letters
American Physical Society
Yes (verified by ORBi)
[en] Magnetoelectricity ; Troilite ; Ferroelectric
[en] We report on a first-principles study of the troilite phase of iron sulfide (FeS). We show that even if, a few decades ago, this material was thought to be ferroelectric, the structural transition from the high P63/mmc to the low P6¯2c symmetry phase does not involve polar instabilities, though the space inversion center symmetry is broken. Our calculations and symmetry analysis nevertheless reveal that FeS is magnetoelectric at room temperature with a response larger than the prototypical room-temperature magnetoelectric crystal Cr2O3. We also show that the spin channel decomposition of the polarization exhibits nonzero values in the opposite direction in FeS, which is actually a general hint of the presence of a magnetoelectric monopole in diagonal magnetoelectrics.
Consortium des Equipements de Calcul Intensif (CECI) grant n.1175545, Tier-1, Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS grant n. 2.5020

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