Theory of helimagnons in itinerant quantum systems II: Nonanalytic corrections to Fermi-liquid behavior

Abstract

A recent theory for the ordered phase of helical or chiral magnets such as MnSi is used to calculate observable consequences of the helical Goldstone modes or helimagnons. In systems with no quenched disorder, the helimagnon contributions to the specific heat coefficient is shown to have a linear temperature dependence, while the quasi-particle inelastic scattering rate is anisotropic in momentum space and depends on the electronic dispersion relation. For cubic lattices the generic temperature dependence is given by a non-Fermi-liquid T^(3/2) behavior. The contribution to the temperature dependence of the resistivity is shown to be T^(5/2) in a Boltzmann approximation. The helimagnon thus leads to nonanalytic corrections to Fermi-liquid behavior. Implications for experiments, and for transport theories beyond the Boltzmann level, are discussed.

arXiv comment15 pp., 5 figs, includes Erratum to PRB version

References in corpus (5)

• Cubic magnets with Dzyaloshinskii-Moriya interaction at low T
• Theory of helimagnons in itinerant quantum systems
• Theory of Disordered Itinerant Ferromagnets I: Metallic Phase
• Weak spin-orbit interactions induce exponentially flat mini-bands in magnetic metals without inversion symmetry
• Electron spectrum, thermodynamics and transport in antiferromagnetic metals at low temperatures

Cited by in corpus (21)

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• Geometric frustration inherent to the trillium lattice, a sublattice of the B20 structure
• A Raman study of the temperature and magnetic field dependence of electronic and lattice properties in MnSi
• Non-analytic behavior of 2D itinerant ferromagnets
• Ordered Phases of Itinerant Dzyaloshinsky-Moriya Magnets and Their Electronic Properties
• A microscopic model for spiral ordering along (110) on the MnSi lattice
• Theory of Helimagnons in Itinerant Quantum Systems III: Quasiparticle Description
• Infinite critical boson non-Fermi liquid
• Theory of Helimagnons in Itinerant Quantum Systems IV: Transport in the Weak-Disorder Regime
• Smectons: Soft modes in electronic stripe phases, and their consequences for thermodynamics and transport
• Exact solution of the Boltzmann equation for low-temperature transport coefficients in metals I: Scattering by phonons, antiferromagnons, and helimagnons
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• Generic non-Fermi-liquid behavior of the resistivity in magnets with ferromagnetic, helical, or skyrmionic order
• Electronic Transport at Low Temperatures: Diagrammatic Approach
• Exact solution of the Boltzmann equation for low-temperature transport coefficients in metals II: Scattering by ferromagnons
• Anomalous Transport Behavior in Quantum Magnets
• Anomalous Pinning Fields in Helical Magnets: Screening of the Quasiparticle Interaction
• Analogy between Three-Dimensional Helimagnetic Metals and Two-Dimensional Nonmagnetic Metals: Transport in the Weak-Disorder Regime