Ordered Phases of Itinerant Dzyaloshinsky-Moriya Magnets and Their Electronic Properties

Abstract

A field theory appropriate for magnets that display helical order due to the Dzyaloshinsky-Moriya mechanism, a class that includes MnSi and FeGe, is used to derive the phase diagram in a mean-field approximation. The helical phase, the conical phase in an external magnetic field, and recent proposals for the structure of the A-phase and the non-Fermi-liquid region in the paramagnetic phase are discussed. It is shown that the orientation of the helical pitch vector along an external magnetic field within the conical phase occurs via two distinct phase transitions. The Goldstone modes that result from the long-range order in the various phases are determined, and their consequences for electronic properties, in particular the specific heat, the single-particle relaxation time, and the electrical and thermal conductivities, are derived. Various aspects of the ferromagnetic limit, and qualitative differences between the transport properties of helimagnets and ferromagnets, are also discussed.

22pp, 8 eps figs

References in corpus (10)

• Spontaneous Skyrmion Ground States in Magnetic Metals
• Theory of the helical spin crystal: a candidate for the partially ordered state of MnSi
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• Columnar Fluctuations as a Source of Non-Fermi-Liquid Behavior in Weak Metallic Magnets
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• Theory of Helimagnons in Itinerant Quantum Systems IV: Transport in the Weak-Disorder Regime
• Quantum Electrodynamics and the Origins of the Exchange, Dipole-Dipole, and Dzyaloshinsky-Moriya Interactions in Itinerant Fermion Systems
• Smectons: Soft modes in electronic stripe phases, and their consequences for thermodynamics and transport

Cited by in corpus (13)

• Chiral skyrmions in cubic helimagnet films: the role of uniaxial anisotropy
• Spin waves in a skyrmion crystal
• Domain walls in helical magnets
• Magnetoelectric effects in single crystals of the cubic ferrimagnetic helimagnet Cu2OSeO3
• Room-temperature skyrmion phase in bulk Cu2OSeO3 under high pressures
• Complex itinerant ferromagnetism in noncentrosymmetric Cr11Ge19
• Dual nature of magnetism in MnSi
• Skyrmion lattice hosted in synthetic antiferromagnets and helix modes
• Gyrotropic elastic response of skyrmion crystals to current-induced tensions
• Evolution of Helimagnetic Correlations when approaching the Quantum Critical Point of Mn${}_{1-x}$Fe${}_x$Si
• Generic non-Fermi-liquid behavior of the resistivity in magnets with ferromagnetic, helical, or skyrmionic order
• Electronic relaxation rates in metallic ferromagnets
• Anomalous Transport Behavior in Quantum Magnets