Electronic correlations in iron-pnictide superconductors and beyond; what can we learn from optics

Abstract

The Coulomb repulsion, impeding electrons' motion, has an important impact on the charge dynamics. It mainly causes a reduction of the effective metallic Drude weight (proportional to the so-called optical kinetic energy), encountered in the optical conductivity, with respect to the expectation within the nearly-free electron limit (defining the so-called band kinetic energy), as evinced from band-structure theory. In principle, the ratio between the optical and band kinetic energy allows defining the degree of electronic correlations. Through spectral weight arguments based on the excitation spectrum, we provide an experimental tool, free from any theoretical or band-structure based assumptions, in order to estimate the degree of electronic correlations in several systems. We first address the novel iron-pnictide superconductors, which serve to set the stage for our approach. We then revisit a large variety of materials, ranging from superconductors, to Kondo-like systems as well as materials close to the Mott-insulating state. As comparison we also tackle materials, where the electron-phonon coupling dominates. We establish a direct relationship between the strength of interaction and the resulting reduction of the optical kinetic energy of the itinerant charge carriers.

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• Fractional power-law behavior and its origin in iron-chalcogenide and ruthenate superconductors: Insights from first-principles calculations
• Quantum criticality in the iron pnictides and chalcogenides
• Ab initio Evidence for Strong Correlation Associated with Mott Proximity in Iron-based Superconductors
• Superconductivity and its mechanism in an ab initio model for electron-doped LaFeAsO
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Anisotropic in-plane optical conductivity in detwinned Ba(Fe1-xCox)2As2
• Electronic correlation assisted ferroelectric metallic state in LiOsO${}_3$
• Optical properties of V2O3 in its whole phase diagram
• Strong electronic correlations in iron pnictides: Comparison of the optical spectra for BaFe2As2-related compounds
• Kinetic energy driven superconductivity, the origin of the Meissner effect, and the reductionist frontier
• Orbital-dependent effects of electron correlations in microscopic models for iron-based superconductors
• Correlation, doping and interband effects on the optical conductivity of iron superconductors
• Optical conductivity of an interacting Weyl liquid in the collisionless regime
• Electronic Correlations and Evolution of the Charge-Density Wave in the Kagome Metals $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs)
• Electrodynamics of BaFe2As2 from infrared measurements under pressure
• Electron Correlation and Spin Dynamics in Iron Pnictides and Chalcogenides
• Magnetic and Ising quantum phase transitions in a model for isoelectronically tuned iron pnictides
• Electrodynamic properties of an artificial heterostructured superconducting cuprate
• The perils of minimal coupling to electromagnetic field in quantum many-body systems
• Near room-temperature ferromagnetism from double-exchange in the van der Waals material CrGeTe${}_3$: evidence from optical conductivity under pressure
• Optical conductivity of the metallic pyrochlore iridate Pr${}_2$Ir${}_2$O${}_7$: Influence of spin-orbit coupling and electronic correlations on the electronic structure
• Electronic layer decoupling driven by density-wave order in La${}_4$Ni${}_3$O${}_{10}$
• Evolution of charge dynamics in FeSe${}_{1-x}$Te${}_x$: Effects of electronic correlations and nematicity