Helical glasses near ferromagnetic quantum criticality

Article

关键词: PHASE-TRANSITIONS;    ANISOTROPY;    STATE;    MNSI;   

DOI  :  10.1103/PhysRevB.87.224203

来源: SCIE

【 摘 要 】

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.

【 授权许可】

Free