Anomalous Pinning Fields in Helical Magnets: Screening of the Quasiparticle Interaction
Strongly Correlated Electrons
2013-10-01 v2 Statistical Mechanics
Abstract
The spin-orbit interaction strength g_so in helical magnets determines both the pitch wave number q and the critical field H_c1 where the helix aligns with an external magnetic field. Within a standard Landau-Ginzburg-Wilson (LGW) theory, a determination of g_so in MnSi and FeGe from these two observables yields values that differ by a factor of 20. This discrepancy is remedied by considering the fermionic theory underlying the LGW theory, and in particular the effects of screening on the effective electron-electron interaction that results from an exchange of helical fluctuations.
Keywords
Cite
@article{arxiv.0908.3342,
title = {Anomalous Pinning Fields in Helical Magnets: Screening of the Quasiparticle Interaction},
author = {T. R. Kirkpatrick and D. Belitz},
journal= {arXiv preprint arXiv:0908.3342},
year = {2013}
}
Comments
4pp, 2 figs