Orbital selective phase transition induced by different magnetic states: A dynamical cluster approximation study

Abstract

Motivated by the unexplored complexity of phases present in the multiorbital Hubbard model, we analyze in this work the behavior of a degenerate two-orbital anisotropic Hubbard model at half filling where both orbitals have equal bandwidths and one orbital is constrained to be paramagnetic (PM), while the second one is allowed to have an antiferromagnetic (AF) solution. Such a model may be relevant for a large class of correlated materials with competing magnetic states in different orbitals like the recently discovered Fe-based superconductors. Using a dynamical cluster approximation we observe that novel orbital selective phase transitions appear regardless of the strength of the Ising Hund's rule coupling $J_z$. Moreover, the PM orbital undergoes a transition from a Fermi liquid (FL) to a Mott insulator through a non-FL phase while the AF orbital shows a transition from a FL to an AF insulator through an AF metallic phase. We discuss the implications of the results in the context of the Fe-based superconductors.

5 pages and 5 figures, and accepted in Rapid communication in PRB

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• Orbital-selective Mott transitions in a doped two-band Hubbard model with crystal field splitting
• A General Mechanism for Orbital Selective Phase Transitions
• Competition between band and Mott insulator in the bilayer Hubbard model: a dynamical cluster approximation study
• Extended regime of coexisting metallic and insulating phases in a two-orbital electronic system
• Can Orbital-Selective Néel Transitions Survive Strong Nonlocal Electronic Correlations?
• Orbital Selective Mott Transition Induced by Orbitals with Distinct Noninteracting Densities of States
• Orbital Selective Phase Transition
• Single-component molecular material hosting antiferromagnetic and spin-gapped Mott subsystems
• Distinct Nature of Orbital Selective Mott Phases Dominated by the Low-energy Local Spin Fluctuations
• Semiclassical approximation solved by Monte Carlo as an efficient impurity solver for dynamical mean field theory and its cluster extensions
• Band crossover and magnetic phase diagram of high-Tc superconducting compound Ba2CuO4-δ
• Orbitally-selective Breakdown of the Fermi Liquid and Simultaneous Enhancement of Metallic and Insulating States in Correlated Multi-band Systems with Spin-orbit Coupling