Study of phase diagram and superconducting states in LaFeAsO${}_{1-x}$H${}_x$ based on the multiorbital extended Hubbard model

Abstract

To understand the recently established unique magnetic and superconducting phase diagram of LaFeAsO${}_{1-x}$H${}_x$, we analyze the realistic multiorbital tight-binding model for $x=0\sim 0.4$ beyond the rigid band approximation. Both the spin and orbital susceptibilities are calculated in the presence of the Coulomb and charge quadrupole interactions. It is found that both orbital and spin fluctuations strongly develop at both $x\sim 0$ and 0.4, due to the strong violation of the rigid band picture in LaFeAsO${}_{1-x}$H${}_x$. Based on this result, we discuss the experimental phase diagram, especially the double-dome superconducting phase. Moreover, we show that the quadrupole interaction is effectively produced by the vertex correction due to Coulomb interaction, resulting in the mutual development of spin and orbital fluctuations.

5 pages, 5 figures, to be published in Phys. Rev. B (Rapid Communications)

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• High-Tc Superconductivity near the Anion Height Instability in Fe-based Superconductors: Analysis of LaFeAsO${}_{1-x}$H${}_x$
• Model of the Electronic Structure of Electron-Doped Iron-Based Superconductors: Evidence for Enhanced Spin Fluctuations by Diagonal Electron Hopping
• Superconductivity at 52 K in hydrogen-substituted LaFeAsO1-xHx under high pressure
• Evolution of the Phase Diagram of LaFeP${}_{1-x}$As${}_x$O${}_{1-y}$F${}_y$ ($y$ = 0 -- 0.1)
• Quantum critical behavior in heavily doped LaFeAsO${}_{1-x}$H${}_x$ pnictide superconductors analyzed using nuclear magnetic resonance
• Heavily Hydride-ion-doped 1111-type Iron-based Superconductors: Synthesis, Physical Properties and Electronic Structure
• Quantum Phase transition under pressure in a heavily hydrogen-doped iron-based superconductor LaFeAsO
• Multiple-pseudogap phases in hydrogen-doped LaFeAsO system
• Universal quasi-degenerate orbital origin of two-dome phases in iron pnictide superconductors
• Metal-insulator transition and superconductivity in the two-orbital Hubbard-Holstein model for iron-based superconductors