THz Magneto-electric atomic rotations in the chiral compound Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$

Abstract

We have determined the terahertz spectrum of the chiral langasite Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$ by means of synchrotron-radiation measurements. Two excitations are revealed that are shown to have a different nature. The first one, purely magnetic, is observed at low temperature in the magnetically ordered phase and is assigned to a magnon. The second one persits far into the paramagnetic phase and exhibits both an electric and a magnetic activity at slightly different energies. This magnetoelectric excitation is interpreted in terms of atomic rotations and requires a helical electric polarization.

References in corpus (11)

• Oxide spintronics
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• Dynamical magneto-electric coupling in helical magnets
• Origin of electromagnon excitations in \textit{R}MnO${}_3$
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• Terahertz time-domain spectroscopy of electromagnons in multiferroic perovskite manganites
• Parity Broken Chiral Spin Dynamics in Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$
• Magnetic chirality as probed by neutron scattering
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• Effect of divalent Ba cation substitution with Sr on coupled multiglass state in the magnetoelectric multiferroic compound Ba3NbFe3Si2O14
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