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Article Dans Une Revue Physical Review Letters Année : 2008

Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14

Résumé

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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Dates et versions

hal-00322722 , version 1 (18-09-2008)
hal-00322722 , version 2 (18-09-2008)
hal-00322722 , version 3 (14-12-2008)

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Citer

Karol Marty, Virginie Simonet, Eric Ressouche, Rafik Ballou, Pascal Lejay, et al.. Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14. Physical Review Letters, 2008, 101 (24), pp.247201. ⟨10.1103/PhysRevLett.101.247201⟩. ⟨hal-00322722v3⟩
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