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

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 obtai...

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Published in:Physical review letters 2011, Vol.106 (20)
Main Authors: Loire, Mickael, Simonet, Virginie, Petit, Sylvain, Marty, Karol, Bordet, Pierre, Lejay, Pascal, Ollivier, Jacques, Enderle, Mechthild, Steffens, Paul, Ressouche, Eric, Zorko, Andrej, Ballou, Rafik
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Condensed Matter
Physics
Strongly Correlated Electrons
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container_title Physical review letters
container_volume 106
creator Loire, Mickael
Simonet, Virginie
Petit, Sylvain
Marty, Karol
Bordet, Pierre
Lejay, Pascal
Ollivier, Jacques
Enderle, Mechthild
Steffens, Paul
Ressouche, Eric
Zorko, Andrej
Ballou, Rafik
description 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.
doi_str_mv 10.1103/PhysRevLett.106.207201
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subjects Condensed Matter
Physics
Strongly Correlated Electrons
title Parity Broken Chiral Spin Dynamics in Ba$_3$NbFe$_3$Si$_2$O$_{14}
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