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Crystal symmetry lowering in chiral multiferroic ${\mathrm{Ba}}_{3}{\mathrm{TaFe}}_{3}{\mathrm{Si}}_{2}{\mathrm{O}}_{14}$ observed by x-ray magnetic scattering

Ramakrishnan, M. ; Joly, Y. ; Windsor, Y. W. ; Rettig, L. ; Alberca, Aurora ; Bothschafter, E. M. ; Lejay, P. ; Ballou, R. ; Simonet, V. ; Scagnoli, V. ; Staub, U.

In: Physical Review B, 2017, vol. 95, no. 20, p. 205145

Chiral multiferroic langasites have attracted attention due to their doubly chiral magnetic ground state within an enantiomorphic crystal. We report on a detailed resonant soft x-ray diffraction study of the multiferroic Ba3TaFe3Si2O14 at the Fe L2,3 and oxygen K edges. Below TN (≈27K) we observe the satellite reflections (0,0,τ), (0,0,2τ), (0,0,3τ), and (0,0,1−3τ) where...