1998/12/31 by D. Belitz, T. R. Kirkpatrick, Thomas Vojta · 5 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Theoretical and Computational Physics #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.82.4707
published as Phys. Rev. Lett. vol. 82, pp. 4707-4710 (1999) · 4 pp., REVTeX, epsf, 3 eps figs, final version as published
openalex publication_date 1999/06/07 · arxiv created 1999/08/31 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
It is shown that the phase transition in low- Tc 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 end point. A semiquantitative discussion is given in terms of recent experiments on MnSi, and predictions for other experiments are made.