Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14

Details Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14 Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14

2008-09-18

arxiv.org/abs/0809.3067v2

Physical Review Letters 101, 24 (2008) 247201

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.101.247201

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.

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