Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14

Abstract

A novel doubly chiral magnetic order is found out in the structurally chiral langasite compound Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$. The magnetic moments are distributed over planar frustrated triangular lattices of triangle units. On each of these they form the same triangular configuration. This ferro-chiral arrangement is helically modulated from plane to plane. Unpolarized neutron scattering on a single crystal associated with spherical neutron polarimetry proved that a single triangular chirality together with a single helicity is stabilized in an enantiopure crystal. A mean field analysis allows discerning the relevance on this selection of a twist in the plane to plane supersuperexchange paths.

References in corpus (7)

• Spin current and magneto-electric effect in non-collinear magnets
• Ferroelectricity in spiral magnets
• Spin chirality on a two-dimensional frustrated lattice
• Symmetry breaking due to Dzyaloshinsky-Moriya interactions in the kagome lattice
• Direct transition from a disordered to a multiferroic phase on a triangular lattice
• Magnetic Frustration on a Kagomé Lattice in R$\_3$Ga$\_5$SiO$\_14$ Langasites with R = Nd, Pr
• Chiral scattering in complex magnets

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• Parity Broken Chiral Spin Dynamics in Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$
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• Effect of divalent Ba cation substitution with Sr on coupled multiglass state in the magnetoelectric multiferroic compound Ba3NbFe3Si2O14
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