Parity Broken Chiral Spin Dynamics in Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$

Abstract

The spin wave excitations emerging from the chiral helically modulated 120${}^{\circ }$ magnetic order in a langasite Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$ enantiopure crystal were investigated by unpolarized and polarized inelastic neutron scattering. A dynamical fingerprint of the chiral ground state is obtained, singularized by (i) spectral weight asymmetries answerable to the structural chirality and (ii) a full chirality of the spin correlations observed over the whole energy spectrum. The intrinsic chiral nature of the spin waves elementary excitations is shown in absence of macroscopic time reversal symmetry breaking.

References in corpus (6)

• Spin chirality on a two-dimensional frustrated lattice
• Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14
• Magnetic and dielectric properties in the langasite-type compounds : A3BFe3D2O14 with A=Ba, Sr, Ca, B=Ta, Nb, Sb and D=Ge, Si
• Single magnetic chirality in the magneto-electric NdFe${}_3$(${}^{11}$BO${}_3$)${}_4$
• Helical spin-waves, magnetic order, and fluctuations in the langasite compound Ba3NbFe3Si2O14
• Chiral fluctuations in triangular antiferromagnets at $T\ll T_N$

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