THz Magneto-electric atomic rotations in the chiral compound Ba3NbFe3Si2O14
Résumé
We have determined the terahertz spectrum of the chiral langasite BaNbFe3Si2O14 by means of synchrotron-radiation measurements. Two excitations are revealed that are shown to have a different nature. The first one, purely magnetic, is observed at low temperature in the magnetically ordered phase and is assigned to a magnon. The second one persits far into the paramagnetic phase and exhibits both an electric and a magnetic activity at slightly different energies. This magnetoelectric excitation is interpreted in terms of atomic rotations and requires a helical electric polarization.
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Supplemental_Material_cromagnons_PRL7.pdf (160.38 Ko)
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cromagnons_PRL7.pdf (1.49 Mo)
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Origine : Fichiers produits par l'(les) auteur(s)
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