Universal quasi-degenerate orbital origin of two-dome phases in iron pnictide superconductors
arXiv:2512.20284 · doi:10.1103/cdgy-gwyj
Abstract
A series of experiments revealed that novel bipartite magnetic and superconducting (SC) phases widely exist in the phase diagrams of iron pnictides and chalcogenides. Nevertheless, the origin of the two-dome magnetic and SC phases in iron-based compounds remains unclear. Here we theoretically investigated the electronic structures, magnetic and SC properties of three representative iron-based systems, i.e. LaFeAsOH, LaFeAsPO and KFeAs. We propose a unified quasi-degenerate orbital mechanism for the emergence of the two-dome parent magnetic/structural phase and the subsequent two-dome SC phase. It is found that the degenerate in-plane anisotropic orbitals dominate the first magnetic/structural and SC phases, while in-plane isotropic orbitals or with quasi-degeneracy originating from quasi-symmetry drive the emergence of the second magnetic/SC dome phase. Moreover, a matching rule of spin and orbital modes for SC pairing state is proposed in multi-orbital iron-based systems. These results imply an orbital-driven mechanism as well as an orbital-selective scenario, and shed light on the understanding of the multi-dome magnetic and SC phases in multi-orbital systems.
36 pages, 16 figures; this article supersedes arXiv: 1701.02500
References in corpus (25)
- Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
- Superconductivity at 43 K in Samarium-arsenide Oxides
- Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsOF}
- LaFeAsOF: A low carrier density superconductor near itinerant magnetism
- Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
- Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
- Competing Orders and Spin-Density-Wave Instability in La(OF)FeAs
- Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
- Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
- Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
- Orbital-Selective Mott transition out of band degeneracy lifting
- Fermi surface of superconducting LaFePO determined by quantum oscillations
- Orbital-selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K(1-x)Fe(2-y)Se2
- Bipartite magnetic parent phases in the iron-oxypnictide superconductor
- High-temperature superconductivity stabilized by electron-hole interband coupling in collapsed tetragonal phase of KFe2As2 under high pressure
- Evolution of the Phase Diagram of LaFePAsOF ( = 0 -- 0.1)
- Emergence of Novel Antiferromagnetic Order Intervening between Two Superconducting Phases in LaFe(As_1-x_P_x_)O: 31P-NMR Studies
- Origin of the superconducting state in the collapsed tetragonal phase of KFe2As2
- Quantum critical behavior in heavily doped LaFeAsOH pnictide superconductors analyzed using nuclear magnetic resonance
- Cooperative effects of Coulomb and electron-phonon interactions in the two-dimensional 16-band d-p model for iron-based superconductors
- Non-Fermi-Liquid Transport Phenomena and Superconductivity Driven by Orbital Fluctuations in Iron Pnictides: Analysis by Fluctuation-Exchange Approximation
- Origin of doping-induced suppression and reemergence of magnetism in LaFeAsOH
- Preferred Spin Excitations in the Bilayer Iron-Based Superconductor CaK(FeNi)As with Spin-Vortex Crystal Order
- Experimental evidence of enhancement without the influence of spin fluctuations: NMR study on LaFeAsO_{1-x}H_x under a pressure of 3.0 GPa
- Coexistence of localized and itinerant magnetism in intercalated iron-selenide (Li,Fe)OHFeSe