Ultrasound data reveal symmetry-selective coupling between acoustic modes and magnetic phases in Ba2CuGe2O7, and a toy model attributes the cycloid-mode coupling to rotational Dzyaloshinskii-Moriya magnetoelastic interactions.
The key ingredient of the theory is the derivative of the exchange parameters ∂2 ¯J αβ δ /∂Rµ∂Rν
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Rotational magnetoelastic interactions in the Dzyaloshinskii-Moriya magnet Ba$_2$CuGe$_2$O$_7$
Ultrasound data reveal symmetry-selective coupling between acoustic modes and magnetic phases in Ba2CuGe2O7, and a toy model attributes the cycloid-mode coupling to rotational Dzyaloshinskii-Moriya magnetoelastic interactions.