Electronic polarons and bipolarons in Fe-based superconductors: a pairing mechanism

Abstract

Superconductivity is a fascinating example of how "more is different". It is due to electrons binding into bosonic Cooper pairs, which exhibit coherent behavior across a macroscopic sample. Finding the mechanism responsible for this binding is one of the more difficult tasks of condensed matter physics. For conventional superconductors the solution was given by the BCS theory as being due to exchange of phonons. For the cuprate high-Tc superconductors a widely-accepted explanation is still missing despite intense effort. The recently discovered Fe-based high-Tc superconductors pose now a new challenge. We present here a quantum mechanical theory for pnictides describing the influence of the large electronic polarizability of the heavy anions. We demonstrate that its inclusion results in electronic polarons as the low-energy quasi-particles and also unveils a pairing mechanism for these electronic polarons.

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Cited by in corpus (28)

• Gap symmetry and structure of Fe-based superconductors
• Pairing Symmetry and Pairing State in Ferropnictides: Theoretical Overview
• Comparison of Ab initio Low-Energy Models for LaFePO, LaFeAsO, BaFe2As2, LiFeAs, FeSe and FeTe: Electron Correlation and Covalency
• Critical role of substrate in the high temperature superconductivity of single layer FeSe on Nb:BaTiO${}_3$
• Functional Renormalization Group for multi-orbital Fermi Surface Instabilities
• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
• Low-energy models for correlated materials: bandwidth renormalization from Coulombic screening
• Nanoscale electronic order in iron pnictides
• Robustness of s-wave Pairing in Electron-Overdoped ${\text{A}}_{1-y}{\text{Fe}}_{2-x}{\text{Se}}_2$
• Superconductivity-induced optical anomaly in an iron arsenide
• Bound States of Defects in Superconducting LiFeAs Studied by Scanning Tunneling Spectroscopy
• Correlated materials design: prospects and challenges
• Synthesis and physical properties of $\mathbf{La}{\mathbf{O}}_{1-\mathbf{x}}{\mathbf{F}}_{\mathbf{x}}\mathbf{FeAs}$
• Dynamic electron correlations with charge order wavelength along all directions in the copper oxide plane
• Fractons from polarons
• Progressive slowing down of spin fluctuations in underdoped LaFeAsO${}_{1-x}$F${}_x$
• Strong Coupling of the Iron-Quadrupole and Anion-Dipole Polarizations in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Few-particle Green's functions for strongly correlated systems on infinite lattices
• Extended Hubbard model of superconductivity driven by charge fluctuations in iron-pnictides
• Pump Probe Spectroscopy of Bose Polarons: Dynamical Formation and Coherence
• Polarons and their induced interactions in highly imbalanced triple mixtures
• Crystal Symmetry and Magnetic Order in Iron Pnictides: a Tight Binding Wannier Function Analysis
• Capacitance and compressibility of heterostructures with strong electronic correlations
• New insight into the physics of iron pnictides from optical and penetration depth data
• The role of the lattice structure in determining the magnon-mediated interactions between charge carriers doped into a magnetically ordered background
• Pairing mechanism in Fe pnictide superconductors
• Contrast of LiFeAs with isostructural, isoelectronic, and non-superconducting MgFeGe
• Nematicity in LaFeAsO${}_{1-x}$F${}_x$