Fermiology, Orbital Order, Orbital Fluctuation and Cooper Pairing in Iron-based Superconductors

Abstract

We address two important issues that arise in recent studies of iron-based superconductivity. (1) Why are the T_c of A_xFe_{2-y}Se_2 and the single unit cell FeSe on SrTiO${}_3$ so high despite both only have electron pockets? (2) What (if any) are the effects of orbital order and orbital fluctuation on the Cooper pairing. Our conclusions are summarized in the third paragraph of the paper.

5 pages, references updated

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Cited by in corpus (42)

• Nematic order in iron superconductors - who is in the driver's seat?
• Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor
• Anomalous correlation effects and unique phase diagram of electron doped FeSe revealed by angle resolved photoemission spectroscopy
• Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunneling microscopy
• Low-energy microscopic models for iron-based superconductors: a review
• Magnetism, superconductivity, and spontaneous orbital order in iron-based superconductors: who comes first and why?
• Fe-based superconductors: seven years later
• Superconducting gap anisotropy in monolayer FeSe thin film
• Orbital selective pairing and superconductivity in iron selenides
• Orbital selectivity and emergent superconducting state from quasi-degenerate $s-$ and $d-$wave pairing channels in iron-based superconductors
• Orbital-selective superconductivity, gap anisotropy and spin resonance excitations in a multiorbital t-J1-J2 model for iron pnictides
• Superconductivity in FeSe thin films driven by the interplay between nematic fluctuations and spin-orbit coupling
• Surface electronic structure and evidence of plain s-wave superconductivity in (Li0.8Fe0.2)OHFeSe
• Interplay between magnetism, superconductivity, and orbital order in a 5-pocket model for iron-based superconductors - a parquet renormalization group study
• Competing instabilities, orbital ordering and splitting of band degeneracies from a parquet renormalization group analysis of a 4-pocket model for iron-based superconductors: application to FeSe
• Manipulation of gap nodes by uniaxial strain in iron-based superconductors
• Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors
• A brief review on muSR studies of unconventional Fe and Cr-based superconductors
• Neutron-scattering measurements of the spin excitations in LaFeAsO and Ba(Fe${}_{0.953}$Co${}_{0.047}$)${}_2$As${}_2$: Evidence for a sharp enhancement of spin fluctuations by nematic order
• Evidence for d-wave superconductivity in single layer FeSe/SrTiO3 probed by quasiparticle scattering off step edges
• Collective modes in multiband superconductors: Raman scattering in iron selenides
• Superconductivity-enhanced Nematicity and '$s+d$' Gap Symmetry in Fe(Se${}_{1-x}$S${}_x$)
• Heterostructural one-unit-cell FeSe/SrTiO3: from high-temperature superconductivity to topological states
• An extensive impurity-scattering study on the pairing symmetry of monolayer FeSe films on SrTiO3
• Strong ferromagnetic exchange interaction in the parent state of the superconductivity in BaFe${}_2$S${}_3$
• Lattice distortion induced first and second order topological phase transition in rectangular high-T${}_{\mathrm{c}}$ superconducting monolayer
• Displacement and annihilation of Dirac gap-nodes in d-wave iron-based superconductors
• Doping dependence of the anisotropic quasiparticle interference in NaFe1-xCoxAs iron-based superconductors
• Sign reversal superconducting gaps revealed by phase referenced quasi-particle interference of impurity induced bound states in (Li${}_{1-x}$Fe${}_x$)OHFe${}_{1-y}$Zn${}_y$Se
• Charge order driven by multiple-Q spin fluctuations in heavily electron-doped iron selenide superconductors
• Observation of a Hidden Hole-Like Band Approaching the Fermi Level in K-Doped Iron Selenide Superconductor
• The Crossover from Ordinary to Higher-Order van Hove Singularity in a Honeycomb System: A Parquet Renormalization Group Analysis
• Two-Fluid Description for Iron-Based Superconductors
• Itinerant scenario for Fe-pnictides: comparison with quantum Monte Carlo
• Resonance states near a quantum magnetic impurity in single-layer FeSe superconductors with $d$-wave symmetry
• Orbital-dependent modulation of the superconducting gap in uniaxially strained Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$
• Capping layer influence and isotropic in-plane upper critical field of the superconductivity at the FeSe/SrTiO3 interface
• Superconducting states of a J1-J2-K model for iron pnictides
• LaO as a candidate substrate for realizing superconductivity in FeSe epitaxial film