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

Andrej Zorko; Eric Ressouche (SPSMS); Jacques Ollivier (ILL); Karol Marty (NEEL; Mechthild Enderle (ILL); Mickael Loire (NEEL); ORNL); Pascal Lejay (NEEL); Paul Steffens (ILL); Pierre Bordet (NEEL)

Parity Broken Chiral Spin Dynamics in Ba₃NbFe₃Si₂O₁₄

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arxiv 1010.2008 v2 pith:HHJWX5YY submitted 2010-10-11 cond-mat.str-el

Parity Broken Chiral Spin Dynamics in Ba₃NbFe₃Si₂O₁₄

Mickael Loire (NEEL) , Virginie Simonet (NEEL) , Sylvain Petit (LLB) , Karol Marty (NEEL , ORNL) , Pierre Bordet (NEEL) , Pascal Lejay (NEEL) , Jacques Ollivier (ILL)

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Mechthild Enderle (ILL) Paul Steffens (ILL) Eric Ressouche (SPSMS) Andrej Zorko Rafik Ballou (NEEL)

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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.

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