Phase Diagram of the Two-Leg Kondo Ladder

Abstract

The phase diagram of the two-leg Kondo ladder is investigated using computational techniques. Ferromagnetism is present, but only at small conduction electron densities and robust Kondo coupling $J$. For densities $n\gtrsim 0.4$ and any Kondo coupling, a paramagnetic phase is found. We also observed spin dimerization at densities $n$=1/4 and $n$=1/2. The spin structure factor at small $J$ peaks at $\vec{q}$=$(2n,0)\pi$ for $n\lesssim 0.5$, and at $\vec{q}$=$(n,1)\pi$ for $n\gtrsim 0.5$. The charge structure factor suggests that electrons behave as free particles with spin-1/2 (spin-0) for small (large) $J$.

arXiv comment5 pages, 4 figs

References in corpus (18)

• Correlated Electrons in High Temperature Superconductors
• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• Phase Separation in Electronic Models for Manganites
• Resonating Valence Bond Theory of Coupled Heisenberg Chains
• Correlations in a two--chain Hubbard model
• Quantum Monte Carlo simulations of the half-filled two-dimensional Kondo lattice model
• Strongly reduced gap in the zigzag spin chain with a ferromagnetic interchain coupling
• One-dimensional Kondo lattice at partial band filling
• Localized spin ordering in Kondo lattice models
• Field-induced Antiferromagnetism and the Kondo Insulator-to-Metal Transition
• Dimerization induced by the RKKY interaction
• New Type of Charge and Magnetic order in the Ferromagnetic Kondo Lattice
• Ordering of localized moments in Kondo lattice models
• Phase Transitions in the Symmetric Kondo Lattice Model in Two and Three Dimensions
• Effect of band filling in the Kondo lattice: A mean-field approach
• The spin and charge gaps of the half-filled N-leg Kondo ladders
• Two-channel Kondo Lattice Model on a ladder studied by the Density Matrix Renormalization Group Method
• Correlation exponent K_rho of the one-dimensional Kondo lattice model

Cited by in corpus (6)

• Robust d-wave Pairing Correlations in the Heisenberg Kondo Lattice Model
• Spiral magnetic phases on the Kondo Lattice Model: A Hartree-Fock approach
• Absence of a true long-range orbital order in a two-leg Kondo ladder
• Determinant Quantum Monte Carlo Study of Exhaustion in the Periodic Anderson Model
• Frustrated quantum magnetism in the Kondo lattice on the zigzag ladder
• Coexistence of Pairing Tendencies and Ferromagnetism in a Doped Two-Orbital Hubbard Model on Two-Leg Ladders