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.

7 pages, 4 figures

References in corpus (5)

• Spontaneous Skyrmion Ground States in Magnetic Metals
• Tricritical point and wing structure in the itinerant ferromagnet UGe2
• Theory of smeared quantum phase transitions
• Avoided ferromagnetic quantum critical point: Unusual short-range ordered state in CeFePO
• Itinerant ferromagnetism with finite ranged interactions

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• Flat band magnetism and helical magnetic order in Ni-doped SrCo${}_2$As${}_2$
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• Magnetic domain depinning as possible evidence for two ferromagnetic phases in LaCrGe${}_3$
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• Non-equilibrium behavior of the magnetization in the helimagnetic phases of the rare earth alloys R_{1-x}Y_{x} (R = Gd, Tb, Dy)