D. Belitz, T. R. Kirkpatrick, Thomas Vojta
Published 1998-12-30, updated 1999-08-31Version 2
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.
Comments: 4 pp., REVTeX, epsf, 3 eps figs, final version as published
Journal: Phys. Rev. Lett. vol. 82, pp. 4707-4710 (1999)
First order transition for the optimal search time of Lévy flights with resetting
First Order Transition in the Ginzburg-Landau Model
First order transition in a three dimensional disordered system
