Tricritical behavior in itinerant quantum ferromagnets

Details Tricritical behavior in itinerant quantum ferromagnets Tricritical behavior in itinerant quantum ferromagnets

2004-10-13

arxiv.org/abs/cond-mat/0410344v1

Phys. Rev. Lett. 94, 247205 (2005)

Physics

Condensed Matter

Statistical Mechanics

4pp., 4 eps figures

Scientific paper

10.1103/PhysRevLett.94.247205

It is shown that the peculiar features observed in the low-temperature phase diagrams of ZrZn_2, UGe_2, and MnSi can be understood in terms of a simple mean-field theory. The nature of the ferromagnetic transition changes from second order to first order at a tricritical point, and in a small external magnetic field surfaces of first-order transitions emerge which terminate in quantum critical points. This field dependence of the phase diagram follows directly from the existence of the tricritical point. The quantum critical behavior in a nonzero field is calculated exactly.

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