Quantum triple point and quantum critical endpoints in metallic magnets

Abstract

In low-temperature metallic magnets, ferromagnetic (FM) and antiferromagnetic (AFM) orders can exist in a single system in different parts of the phase diagram as a function of some control parameter. These phases can be adjacent, or exist concurrently, resulting in a phase transition between a FM phase and an AFM one, or between a phase of concurrent FM and AFM order and either of the pure phases. We show that universal quantum fluctuations qualitatively alter the known phase diagrams for classical magnets: They shrink the region of concurrent FM and AFM order, change various transitions from second to first order, and, in the presence of a magnetic field, lead to either a quantum triple point where the FM, AFM and paramagnetic phases coexist, or to a quantum critical end point.

5pp, 4 figs

References in corpus (1)

• Itinerant ferromagnetism in the As 4$p$ conduction band of Ba${}_{0.6}$K${}_{0.4}$Mn${}_2$As${}_2$ identified by x-ray magnetic circular dichroism

Cited by in corpus (8)

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• Unfolding of antiferromagnetic phases and multicritical points in a two-orbital model for Uranium compounds under pressure and magnetic field
• Pressure-induced suppression of ferromagnetism in CePd${}_2$P${}_2$
• Magnetic field induced antiferromagnetic tricritical points in Ce${}_2$Sb and Ce${}_2$Bi