Nonanalytic Magnetization Dependence of the Magnon Effective Mass in Itinerant Quantum Ferromagnets

Details Nonanalytic Magnetization Dependence of the Magnon Effective Mass in Itinerant Quantum Ferromagnets Nonanalytic Magnetization Dependence of the Magnon Effective Mass in Itinerant Quantum Ferromagnets

1998-06-13

arxiv.org/abs/cond-mat/9806168v3

Phys. Rev. B vol. 58, pp. 14155-14158 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pp., REVTeX, no figs

Scientific paper

10.1103/PhysRevB.58.14155

The spin wave dispersion relation in both clean and disordered itinerant quantum ferromagnets is calculated. It is found that effects akin to weak-localization physics cause the frequency of the spin-waves to be a nonanalytic function of the magnetization m. For low frequencies \Omega, small wavevectors k, and small m, the dispersion relation is found to be of the form \Omega ~ m^{1-\alpha} k^2, with \alpha = (4-d)/2 (2

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