2020
DOI: 10.1103/physrevb.102.054417
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Absolute crystal and magnetic chiralities in the langasite compound Ba3NbFe3Si2O14 determined by polarized neutron and x-ray scattering

Abstract: We present a combined polarized neutron and x-ray scattering study on two enantiopure langasite single crystals aimed at the determination of their absolute structural and magnetic chiralities and the coupling between them. Our respective data sets unambiguously reveal two samples of opposite structural chirality, where the magnetic handedness is pinned by the structural one. Simple energy considerations of the magnetic exchange and single-ion anisotropy parameters reveal that it is not the Dzyaloshinskii-Mori… Show more

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Cited by 9 publications
(6 citation statements)
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“…For an enantiopure, the flipping ratios should be close to one set of predicted flipping ratios, which shows much more pronounced asymmetries as exemplified by the (511) and (153) reflections. The results are thus different from enantiopure Ba 3 NbFe 3 Si 2 O 14 single crystals which were previously studied [11,13,32].…”
Section: Schwinger Scatteringcontrasting
confidence: 84%
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“…For an enantiopure, the flipping ratios should be close to one set of predicted flipping ratios, which shows much more pronounced asymmetries as exemplified by the (511) and (153) reflections. The results are thus different from enantiopure Ba 3 NbFe 3 Si 2 O 14 single crystals which were previously studied [11,13,32].…”
Section: Schwinger Scatteringcontrasting
confidence: 84%
“…In the reference frame of a moving neutron, the electric field of a noncentrosymmetric crystal creates an effective magnetic field which couples to the neutron spin. This neutron spin-orbit interaction results in a polarization-dependant scattering known as Schwinger scattering [30] which can be used as a probe of the structural handedness of the crystal [31,32].…”
Section: Schwinger Scattering For Structural Handednessmentioning
confidence: 99%
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“…This neutron spin-orbit interaction results in a polarizationdependant scattering known as Schwinger scattering 30 which can be used as a probe of the structural handedness of the crystal. 31,32 In the local coordinates, where ẑ k i ×k f is perpendicular to the scattering plane, the asymmetric Schwinger structure factor is given by: 32…”
Section: Schwinger Scattering For Structural Handednessmentioning
confidence: 99%
“…This kind of process could take place, for example, in the triangular antiferromagnet Ba 3 NbFe 3 Si 2 O 14 26 . It is important to mention that in a recent article the authors claim that the DMI is not strong enough to lift the chirality degeneracy 27 .…”
Section: Possible Realization In Real Systemsmentioning
confidence: 99%