First order transitions and multicritical points in weak itinerant ferromagnets

Details First order transitions and multicritical points in weak itinerant ferromagnets First order transitions and multicritical points in weak itinerant ferromagnets

1998-12-30

arxiv.org/abs/cond-mat/9812420v2

Phys. Rev. Lett. vol. 82, pp. 4707-4710 (1999)

Physics

Condensed Matter

Statistical Mechanics

4 pp., REVTeX, epsf, 3 eps figs, final version as published

Scientific paper

10.1103/PhysRevLett.82.4707

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.

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