Quantum critical behavior of disordered itinerant ferromagnets

Details Quantum critical behavior of disordered itinerant ferromagnets Quantum critical behavior of disordered itinerant ferromagnets

1996-01-03

arxiv.org/abs/cond-mat/9601008v2

Phys. Rev. B vol. 53, pp. 14364-14376

Physics

Condensed Matter

Statistical Mechanics

14pp., REVTeX, 3 eps figs, final version as published

Scientific paper

10.1103/PhysRevB.53.14364

The quantum ferromagnetic transition at zero temperature in disordered itinerant electron systems is considered. Nonmagnetic quenched disorder leads to diffusive electron dynamics that induces an effective long-range interaction between the spin or order parameter fluctuations of the form r^{2-2d}, with d the spatial dimension. This leads to unusual scaling behavior at the quantum critical point, which is determined exactly. In three-dimensional systems the quantum critical exponents are substantially different from their finite temperature counterparts, a difference that should be easily observable. Experiments to check these predictions are proposed.

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