%0 Journal Article
%T First order transitions and multicritical points in weak itinerant ferromagnets
%A D. Belitz
%A T. R. Kirkpatrick
%A Thomas Vojta
%J Physics
%D 1998
%I arXiv
%R 10.1103/PhysRevLett.82.4707
%X It is shown that the phase transition in low-T_c clean itinerant ferromagnets is generically of first order, due to correlation effects that lead to a nonanalytic term in the free energy. A tricritical point separates the line of first order transitions from Heisenberg critical behavior at higher temperatures. Sufficiently strong quenched disorder suppresses the first order transition via the appearance of a critical endpoint. A semi-quantitative discussion is given in terms of recent experiments on MnSi, and predictions for other experiments are made.
%U http://arxiv.org/abs/cond-mat/9812420v2