Helical bunching and symmetry lowering inducing multiferroicity in Fe langasites

Abstract

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 Ba3MFe3Si2O14 (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{\textdegree} 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.

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Cited by in corpus (5)

• New insight into tuning magnetic phases of $R$Mn${}_6$Sn${}_6$ kagome metals
• Crystal Symmetry Lowering in Chiral Multiferroic Ba${}_3$TaFe${}_3$Si${}_2$O${}_{14}$ observed by X-Ray Magnetic Scattering
• Spin-wave directional anisotropies in antiferromagnetic Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$
• Neutron diffraction in MnSb2O6: Magnetic and structural domains in a helicoidal polar magnet with coupled chiralities
• Magnetic particles and strings in iron langasite