Nonanalytic Corrections to Fermi-Liquid Behavior in Helimagnets

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 T^{5/2}-contribution to the resistivity. The quasi-particle inelastic lifetime shows anisotropic behavior in momentum space.

4pp., 1 eps fig

References in corpus (7)

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• Interplay of disorder and spin fluctuations in the resistivity near a quantum critical point
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Cited by in corpus (8)

• Optical coupling to spin waves in the cycloidal multiferroic BiFeO3
• Theory of helimagnons in itinerant quantum systems
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• Effective Field Theory for Spontaneously Broken Symmetry
• A microscopic model for spiral ordering along (110) on the MnSi lattice
• Helical ordering in the ground state of spin-one color superconductors as a consequence of parity violation
• Infinite critical boson non-Fermi liquid
• Symmetry breaking patterns and collective modes of spin-one color superconductors