MnSb 2 O 6 is based on the structural chiral P 321 space group #150 where the magnetic Mn 2+ moments ( S = 5 / 2, L ≈ 0) order antiferromagnetically at T N = 12 K. Unlike the related iron based langasite (Ba 3 NbFe 3 Si 2 O 14 ) where the low temperature magnetism is based on a proper helix characterized by a time-even pseudo scalar ‘magnetic’ chirality, the Mn 2+ ions in MnSb 2 O 6 order with a cycloidal structure at low temperatures, described instead by a time-even vector ‘magnetic’ polarity. A tilted cycloidal structure has been found [M. Kinoshita et al. Phys. Rev. Lett. 117 , 047201 (2016)] to facilitate ferroelectric switching under an applied magnetic ﬁeld. In this work, we apply polarized and unpolarized neutron diﬀraction analyzing the magnetic and nuclear structures in MnSb 2 O 6 with the aim of understanding this magnetoelectric coupling. We ﬁnd no evidence for a helicoidal magnetic structure with one of the spin envelope axes tilted away from the cycloidal c axis. However, on application of a magnetic ﬁeld k c the spin rotation plane can be tilted, giving rise to a cycloid—helix admixture that evolves towards a distorted helix (zero cycloidal component) for ﬁelds great than ≈ 2 T. We propose a mechanism for the previously reported ferroelectric switching based on coupled structural and magnetic chiralities requiring only an imbalance of structural chiral domains.

Neutron diffraction in MnSb2O6: Magnetic and structural domains in a helicoidal polar magnet with coupled chiralities

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Neutron diffraction in MnSb2O6: Magnetic and structural domains in a helicoidal polar magnet with coupled chiralities