Nonanalytic Corrections to Fermi-Liquid Behavior in Helimagnets
T. R. Kirkpatrick, D. Belitz
Abstract
The Goldstone mode in the ordered phase of itinerant helimagnets, such as MnSi or FeGe, is determined and shown to have a strongly anisotropic dispersion relation. The softness of this mode is, in a well-defined sense, in between that of ferromagnetic and antiferromagnetic magnons, respectively. It is shown that this soft mode leads to nonanalytic corrections to Fermi-liquid behavior, with a T-contribution to the specific heat coefficient, and a T5/2-contribution to the resistivity. The quasi-particle inelastic lifetime shows anisotropic behavior in momentum space.
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