Magnetoresistance in Conical Magnets

Materials with spin-spiral textures can have substantially different electric transport properties compared to topologically trivial materials. We analyse field dependent transport properties in conical magnets, accounting for the change in conical angle with field. We analytically find expressions for the energy bands and eigenstates in the general case. We employ two computational approaches to find current densities, used to find field dependent transport properties such as Hall effects and magnetoresistance. The first approach uses the Boltzmann equation to calculate transition rates in the first Born approximation, accounting for electron phonon scattering. The second approach uses a spin independent approximation for the relaxation time, but is integrated more accurately over the k-volume. We observe several non-trivial behaviors in transport properties. They are explained due to the field dependent bandstructure, as the material transition from a helimagnet to a ferromagnet. The differences between the two approaches show the effects of spin transitions in these materials.