Helical glasses near ferromagnetic quantum criticality

Steven John Thomson, Frank Kruger, Andrew Green

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

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.
Original languageEnglish
Article number224203
Number of pages7
JournalPhysical Review. B, Condensed matter and materials physics
Volume87
Issue number22
DOIs
Publication statusPublished - 26 Jun 2013

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