Abstract
A recent theory for the ordered phase of helical or chiral magnets such as is used to calculate observable consequences of the helical Goldstone modes or helimagnons. In systems with no quenched disorder, the helimagnon contribution to the specific heat coefficient is shown to have a linear temperature dependence, while the quasiparticle 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 behavior. The contribution to the temperature dependence of the resistivity is shown to be 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.
- Received 20 April 2006
DOI:https://doi.org/10.1103/PhysRevB.74.024409
©2006 American Physical Society