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Pré-Publication, Document De Travail Année : 2008

Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14

Karol Marty
  • Fonction : Auteur
Virginie Simonet
Eric Ressouche
Rafik Ballou
Pascal Lejay
  • Fonction : Auteur
Pierre Bordet

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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Karol Marty, Virginie Simonet, Eric Ressouche, Rafik Ballou, Pascal Lejay, et al.. Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14. 2008. ⟨hal-00322722v2⟩
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