Phase transitions in the Hubbard model for the bismuth nickelate

Abstract

We study low temperature properties of the Hubbard model for the bismuth nickelate, where degenerate orbitals in the nickel ions and a single orbital in the bismuth ions are taken into account, combining dynamical mean-field theory with the continuous-time quantum Monte Carlo method. We discuss the effect of the attractive interactions to mimic the valence skipping phenomenon in the bismuth ions. We demonstrate how the charge and magnetically ordered states are stable against thermal fluctuations. It is furthermore clarified that the ferromagnetically ordered and orbital ordered states are stabilized due to the presence of the orbital degeneracy at low temperatures. The crossover between metallic and insulating states is also discussed.

6 pages, 7 figures

References in corpus (5)

• Continuous-time Monte Carlo methods for quantum impurity models
• Beyond extended dynamical mean-field theory: Dual boson approach to the two-dimensional extended Hubbard model
• Theory of Valence Transition in BiNiO${}_3$
• Mott transitions in the Hubbard model with spatially-modulated interactions
• Finite Temperature Properties of Three-Component Fermion Systems in Optical Lattice

Cited by in corpus (4)

• Hybridization-switching induced Mott transition in ABO${}_3$ perovskites
• Unusual Mott transition associated with charge-order melting in BiNiO${}_3$ under pressure
• Mechanism of intermetallic charge transfer and bond disproportionation in BiNiO${}_3$ and PbNiO${}_3$ revealed by hard x-ray photoemission spectroscopy
• Charge Kondo Effect and Superconductivity in the Falikov-Kimball model with the Pair Hopping