Nematicity, magnetism and superconductivity in FeSe under pressure: Unified explanation based on the self-consistent vertex correction theory

Abstract

To understand the rich electronic phase diagram in FeSe under pressure that vividly demonstrates the strong interplay between the nematicity, magnetism and superconductivity, we analyze the electronic states by including the higher-order many-body effects called the vertex correction (VC). We predict the pressure-induced emergence of xy-orbital hole-pocket based on the first-principles analysis. Due to this pressure-induced Lifshitz transition, the spin fluctuations on the xy orbital are enhanced, whereas those on xz,yz orbitals are gradually reduced. For this reason, nonmagnetic orbital order $O=n_{xz}-n_{yz}$, which is driven by the spin fluctuations on xz,yz orbitals through the intra-orbital VCs, is suppressed, and it is replaced with the magnetism of xy-orbital d-electrons. The nodal s-wave state at ambient pressure ($O>0$) and the enhancement of Tc under pressure are driven by the cooperation between the spin and orbital fluctuations.

11 pages, 10 figures. The pressure Hamiltonian of FeSe introduced in the present study has been confirmed by the first principles analysis

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Cited by in corpus (24)

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• Exotic Superconducting States in FeSe-based Materials
• Highly Anisotropic Superconducting Gap in Nematically Ordered and Tetragonal Phases of FeSe${}_{1-x}$S${}_x$
• Origin of diverse nematic orders in Fe-based superconductors: 45${}^{\circ }$ rotated nematicity in AFe${}_2$As${}_2$ (A=Cs, Rb)
• Orbital mismatch boosting nematic instability in iron-based superconductors
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• A Rigorous Formalism of Unconventional Symmetry Breaking in Fermi Liquid Theory and Its Application to Nematicity in FeSe
• Fully gapped s-wave superconductivity enhanced by magnetic criticality in heavy fermion system
• Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe
• ${}^{77}$Se-NMR Study under Pressure on 12%-S Doped FeSe
• Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe
• Fermi surface, pressure-induced antiferromagnetic order, and superconductivity in FeSe
• Nematic Fluctuations in an Orbital Selective Superconductor Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Multipolar nematic state of nonmagnetic FeSe based on the DFT+$U$
• Resurgence of superconductivity and the role of $d_{xy}$ hole band in FeSe${}_{1-x}$Te${}_x$
• Identifying the dominant pairing interaction in high-$T_c$ FeSe superconductors through Leggett modes
• Doping effects on electronic states in electron-doped FeSe: Impact of self-energy and vertex corrections
• Unveiling the quasiparticle behaviour in the pressure-induced high-$T_c$ phase of an iron-chalcogenide superconductor
• Stronger quantum fluctuation with larger spins: Emergent magnetism in the pressurized high-temperature superconductor FeSe
• Photoinduced nematic state in FeSe${}_{0.4}$Te${}_{0.6}$
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• Crossover of Superconductivity across the antiferromagnetic end point in FeSe${}_{1-\mathrm{x}}$S${}_{\mathrm{x}}$ under pressure
• Quasiparticle interaction originating from Bogoliubov Fermi Surfaces under pressure in 18%-S substituted FeSe studied via NMR
• Superconductivity and the quasiparticle mass enhancement near the CDW critical point using Bethe-Salpeter method: Application to cuprates