When magnetic chirality gets excited: spin waves in Ba$_3$NbFe$_3$Si$_2$O$_{14}$
msra(2010)
摘要
The spin wave excitations emerging from the helically modulated ferrochiral
triangular magnetic order in Ba$_3$NbFe$_3$Si$_2$O$_{14}$ were investigated by
neutron scattering on a structurally enantiopure single crystal. The collected
spectra are accounted for in the minimal model explaining the magnetic order
and its total chirality. It is found out that the spin waves excitations
emerging from this order display remarkable properties: (i) spectral
asymmetries answerable to the structural chirality and (ii) spin correlations
evidencing full chirality of the spin dynamics over the whole energy spectrum.
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关键词
neutron scattering,single crystal,spin wave
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