Magnetoelastic interactions are included in a Landau-type free energy, which serves as a basis for the investigation of strains in the helically polarised spin-density-wave phase of MnSi. The existence of linearly and helically polarised lattice-displacement waves at Q and 2Q respectively (where Q is the spin-density-wave wavevector) and a second harmonic of the fundamental spin-density wave are predicted. Expressions for magnetostriction are derived and a comparison with existing data shows good agreement.
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Plumer et al. (1982) studied this question.
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