Cubic magnets with Dzyaloshinskii-Moriya interaction at low T

Details Cubic magnets with Dzyaloshinskii-Moriya interaction at low T Cubic magnets with Dzyaloshinskii-Moriya interaction at low T

2005-09-15

arxiv.org/abs/cond-mat/0509406v1

Physics

Condensed Matter

Strongly Correlated Electrons

submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.73.174402

Ground state and spin-wave spectrum of cubic magnets with the Dzyaloshinskii-Moriya interaction (DMI) such as MnSi and FeGe are studied theoretically. The linear spin-wave theory is developed. The spin-wave spectrum depends strongly on the magnetic field and strongly anisotropic. It is a result of incommensurate magnetic structure when the DMI breaks the total spin conservation law. The spin-wave spectrum is unstable at infinitesimal perpendicular field. If the gap $\Delta$ is introduced the spectrum becomes stable. The gap appears due to cubic anisotropy and the spin-wave interaction considered in the Hartree-Fock approximation. Peculiar properties of the ESR and neutron scattering in the helical magnets are considered and possibilities of corresponding experimental studies are discussed.

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