Helical bunching and symmetry lowering inducing multiferroicity in Fe langasites

The chiral Fe-based langasites represent model systems of triangle-based frustrated magnets with a strong potential for multiferroicity. We report neutron-scattering measurements for the multichiral Ba sub(3)M Fe sub(3) Si sub(2) O sub(14)(M=Nb,Ta) langasites revealing new important features of the...

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Bibliographic Details
Published in:Physical review. B 2016-06, Vol.93 (21), Article 214419
Main Authors: Chaix, L., Ballou, R., Cano, A., Petit, S., de Brion, S., Ollivier, J., Regnault, L.-P., Ressouche, E., Constable, E., Colin, C. V., Zorko, A., Scagnoli, V., Balay, J., Lejay, P., Simonet, V.
Format: Article
Language:English
Subjects:
Bunching
Condensed Matter
Distortion
Grounds
Links
Magnets
Modulation
Physics
Strongly Correlated Electrons
Symmetry
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Summary:The chiral Fe-based langasites represent model systems of triangle-based frustrated magnets with a strong potential for multiferroicity. We report neutron-scattering measurements for the multichiral Ba sub(3)M Fe sub(3) Si sub(2) O sub(14)(M=Nb,Ta) langasites revealing new important features of the magnetic order of these systems: the bunching of the helical modulation along the c axis and the in-plane distortion of the 120[degrees] Fe-spin arrangement. We discuss these subtle features in terms of the microscopic spin Hamiltonian and provide the link to the magnetically induced electric polarization observed in these systems. Thus, our findings put the multiferroicity of this attractive family of materials on solid ground.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.93.214419