Quantum ferromagnetic transition in disordered itinerant electron systems

Details Quantum ferromagnetic transition in disordered itinerant electron systems Quantum ferromagnetic transition in disordered itinerant electron systems

1995-04-05

arxiv.org/abs/cond-mat/9504021v2

Europhys. Lett. vol. 35, pp. 201-206 (1996)

Physics

Condensed Matter

Statistical Mechanics

4pp, REVTeX, no figs, final version as published

Scientific paper

10.1209/epl/i1996-00554-7

An effective field theory is derived for the ferromagnetic transition of diffusive electrons at T=0. The static disorder which leads to diffusive electron dynamics induces an effective long-range interaction between the spins of the form 1/r^(2d-2). This leads to unusual scaling behavior at the quantum critical point, which is determined exactly. The crossover from this quantum fixed point to the classical Heisenberg fixed point should be observable in ferromagnetic materials with low Curie temperatures.

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