Nonanalytic Corrections to Fermi-Liquid Behavior in Helimagnets
Strongly Correlated Electrons
2009-11-11 v1 Statistical Mechanics
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.
Keywords
Cite
@article{arxiv.cond-mat/0506770,
title = {Nonanalytic Corrections to Fermi-Liquid Behavior in Helimagnets},
author = {T. R. Kirkpatrick and D. Belitz},
journal= {arXiv preprint arXiv:cond-mat/0506770},
year = {2009}
}
Comments
4pp., 1 eps fig