2004/10/13 by D. Belitz, T. R. Kirkpatrick, Joerg Rollbuehler +1 · 3 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.94.247205
published as Phys. Rev. Lett. 94, 247205 (2005) · 4pp., 4 eps figures
arxiv created 2004/10/13 · openalex publication_date 2005/06/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
It is shown that the peculiar features observed in the low-temperature phase diagrams of ZrZn2, UGe2, and MnSi can be understood in terms of a simple mean-field theory. The nature of the ferromagnetic transition changes from second order to first order at a tricritical point, and in a small external magnetic field surfaces of first-order transitions emerge which terminate in quantum critical points. This field dependence of the phase diagram follows directly from the existence of the tricritical point. The quantum critical behavior in a nonzero field is calculated exactly.