Quantum critical behavior of itinerant ferromagnets

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

1999-07-26

arxiv.org/abs/cond-mat/9907404v2

Ann. Phys. (Leipzig) 8, 593-602 (1999)

Physics

Condensed Matter

Statistical Mechanics

10 pp., LaTeX, 2 eps figs., requires annalen.cls (included), Invited contribution to Localisation 99, final version as publish

Scientific paper

10.1002/(SICI)1521-3889(199911)8

We investigate the quantum phase transition of itinerant ferromagnets. It is shown that correlation effects in the underlying itinerant electron system lead to singularities in the order parameter field theory that result in an effective long-range interaction between the spin fluctuations. This interaction turns out to be generically {\em antiferromagnetic} for clean systems. In disordered systems analogous correlation effects lead to even stronger singularities. The resulting long-range interaction is, however, generically ferromagnetic. We discuss two possibilities for the ferromagnetic quantum phase transition. In clean systems, the transition is generically of first order, as is experimentally observed in MnSi. However, under certain conditions the transition may be continuous with non-mean field critical behavior. In disordered systems, one finds a very rich phase diagram showing first order and continuous phase transitions and several multicritical points.

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