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Helical glasses near ferromagnetic quantum criticality

Thomson, SJ; Krueger, F; Green, AG; (2013) Helical glasses near ferromagnetic quantum criticality. Physical Review B , 87 (22) , Article 224203. 10.1103/PhysRevB.87.224203. Green open access

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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.

Type: Article
Title: Helical glasses near ferromagnetic quantum criticality
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.87.224203
Publisher version: http://dx.doi.org/10.1103/PhysRevB.87.224203
Language: English
Additional information: ©2013 American Physical Society
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1390990
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