Spiral magnetic phases on the Kondo Lattice Model: A Hartree-Fock approach

Abstract

We study the Kondo Lattice Model (KLM) on a square lattice through a Hartree-Fock approximation in which the local spins are treated semi-classically, in the sense that their average values are modulated by a magnetic wavevector $\mathbf{Q}$ while they couple with the conduction electrons through fermion operators. In this way, we obtain a ground state phase diagram in which spiral magnetic phases (in which the wavevector depends on the coupling constants and on the density) interpolate between the low-density ferromagnetic phase and the antiferromagnetic phase at half filling; within small regions of the phase diagram commensurate magnetic phases can coexist with Kondo screening. We have also obtained `Doniach-like' diagrams, showing the effect of temperature on the ground state phases, and established that for some ranges of the model parameters (the exchange coupling and conduction electron density) the magnetic wavevector changes with temperature, either continuously or abruptly (e.g., from spiral to ferromagnetic).

13 pages, 15 figures

References in corpus (7)

• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Fermi Surface Reconstruction without Breakdown of Kondo Screening at Quantum Critical Point
• Mean Field study of the heavy fermion metamagnetic transition
• Large and Small Fermi-Surface Spin Density Waves in the Kondo Lattice Model
• Weak ferromagnetism with the Kondo screening effect in the Kondo lattice systems
• Phase evolution of the two-dimensional Kondo lattice model near half-filling
• Phase Diagram of the Two-Leg Kondo Ladder

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• Spiral magnetic order, non-uniform states and electron correlations in the conducting transition metal systems
• Incommensurate magnetic order in rare earth and transition metal compounds with local moments
• A mean-field approach to Kondo-attractive-Hubbard model
• Superconducting Kondo phase in an orbitally-separated bilayer
• Magnetism, non-Fermi-liquid behavior and deconfinement in Kondo lattices