The quantum phase transition of itinerant helimagnets

Details The quantum phase transition of itinerant helimagnets The quantum phase transition of itinerant helimagnets

2000-09-28

arxiv.org/abs/cond-mat/0009441v2

Phys. Rev. B 64, 052404 (2001)

Physics

Condensed Matter

Statistical Mechanics

5 pages RevTeX

Scientific paper

10.1103/PhysRevB.64.052404

We investigate the quantum phase transition of itinerant electrons from a paramagnet to a state which displays long-period helical structures due to a Dzyaloshinskii instability of the ferromagnetic state. In particular, we study how the self-generated effective long-range interaction recently identified in itinerant quantum ferromagnets is cut-off by the helical ordering. We find that for a sufficiently strong Dzyaloshinskii instability the helimagnetic quantum phase transition is of second order with mean-field exponents. In contrast, for a weak Dzyaloshinskii instability the transition is analogous to that in itinerant quantum ferromagnets, i.e. it is of first order, as has been observed in MnSi.

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