First order transitions and multicritical points in weak itinerant ferromagnets

Дата и время публикации : 1998-12-30T00:20:30Z

Авторы публикации и институты :
D. Belitz
T. R. Kirkpatrick
Thomas Vojta

Ссылка на журнал-издание: Phys. Rev. Lett. vol. 82, pp. 4707-4710 (1999)
Коментарии к cтатье: 4 pp., REVTeX, epsf, 3 eps figs, final version as published
Первичная категория: cond-mat.stat-mech

Все категории : cond-mat.stat-mech, cond-mat.str-el

Краткий обзор статьи: 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.

Category: Physics