Helical glasses near ferromagnetic quantum criticality
Abstract
We study the effects of quenched charge disorder on the phase reconstruction near itinerant ferromagnetic quantum critical points in three spatial dimensions. Combining a replica disorder average with a fermionic version of the quantum order-by-disorder mechanism, we show that weak disorder destabilizes the ferromagnetic state and enhances the susceptibility towards incommensurate, spiral magnetic ordering. The Goldstone modes of the spiral phase are governed by a 3d-XY model. The induced disorder in the pitch of the spiral generates a random anisotropy for the Goldstone modes, inducing vortex lines in the phase of the helical order and rendering the magnetic correlations short ranged with a strongly anisotropic correlation length.
Keywords
Cite
@article{arxiv.1303.4300,
title = {Helical glasses near ferromagnetic quantum criticality},
author = {S. J. Thomson and F. Krüger and A. G. Green},
journal= {arXiv preprint arXiv:1303.4300},
year = {2013}
}
Comments
7 pages, 4 figures