Itinerant ferromagnetism with finite ranged interactions

Abstract

Quantum fluctuations are of central importance in itinerant ferromagnets; in the case of the Stoner Hamiltonian, with contact interactions, they deliver a rich phase diagram featuring a first order ferromagnetic transition preempted by a spin spiral and a paired density wave. However, to date all analyses of fluctuation corrections neglect the finite ranged nature of the Coulomb interaction. We develop the formalism to consider the effects of fluctuations with a realistic screened Coulomb potential. The finite ranged interaction suppresses the tricritical point temperature of the first order ferromagnetic transition, bringing theory into line with experiment, whilst retaining the exotic spin spiral and paired density wave. In an ultracold atomic gas a finite ranged interaction damps the competing molecular instability, permitting the observation of ferromagnetic correlations.

References in corpus (10)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Formation of a Nematic Fluid at High Fields in Sr3Ru2O7
• Continuum variational and diffusion quantum Monte Carlo calculations
• Jastrow correlation factor for atoms, molecules, and solids
• Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms
• Inhomogeneous backflow transformations in quantum Monte Carlo calculations
• Nonanalytic paramagnetic response of itinerant fermions away and near a ferromagnetic quantum phase transition
• Itinerant ferromagnetism in an atomic Fermi gas: Influence of population imbalance
• Avoided ferromagnetic quantum critical point: Unusual short-range ordered state in CeFePO
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Cited by in corpus (13)

• Itinerant Ferromagnetism in a polarized two-component Fermi gas
• Quantum Order-by-Disorder in Strongly Correlated Metals
• Resummation of fluctuations near ferromagnetic quantum critical points
• Effective-range dependence of resonant Fermi gases
• Itinerant ferromagnetism in 1D two-component Fermi gases
• Helical glasses near ferromagnetic quantum criticality
• Effective-range dependence of two-dimensional Fermi gases
• Jastrow correlation factor for periodic systems
• Interaction energy and itinerant ferromagnetism in a strongly interacting Fermi gas in the absence of molecule formation
• Finite range and upper branch effects on itinerant ferromagnetism in repulsive Fermi gases: Bethe-Goldstone ladder resummation approach
• Multi-particle instability in a spin-imbalanced Fermi gas
• Itinerant ferromagnetism of a dipolar Fermi gas with Raman-induced spin-orbit coupling
• Electronic spin-triplet nematic with a twist