Non-rigid band shift and non-monotonic electronic structure changes upon doping in the normal state of the pnictide high temperature superconductor Ba2(Fe1-xCox)2As2

Abstract

We report systematic Angle Resolved Photoemission (ARPES) experiments using different photon polarizations and experimental geometries and find that the doping evolution of the normal state of Ba(Fe1-xCox)2As2 deviates significantly from the predictions of a rigid band model. The data reveal a non-monotonic dependence upon doping of key quantities such as band filling, bandwidth of the electron pocket, and quasiparticle coherence. Our analysis suggests that the observed phenomenology and the inapplicability of the rigid band model in Co-doped Ba122 are due to electronic correlations, and not to either the size of the impurity potential, or self-energy effects due to impurity scattering. Our findings indicate that the effects of doping in pnictides are much more complicated than currently believed. More generally, they indicate that a deep understanding of the evolution of the electronic properties of the normal state, which requires an understanding of the doping process, remains elusive even for the 122 iron-pnictides, which are viewed as the least correlated of the high-TC unconventional superconductors.

arXiv commentAccepted in Phys. Rev. B

References in corpus (27)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• Gap symmetry and structure of Fe-based superconductors
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Magnetic order in BaFe2As2, the parent compound of the FeAs based superconductors in a new structural family
• Defects in correlated metals and superconductors
• FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2
• Critical change in the Fermi surface of iron arsenic superconductors at the onset of superconductivity
• Signature of Superfluid Density in the Single-Particle Excitation Spectrum of Bi2Sr2CaCu2O8+delta
• Where Are the Extra d Electrons in Transition-Metal Substituted Fe Pnictides?
• Importance of Fermi surface topology for high temperature superconductivity in electron-doped iron arsenic superconductors
• Electronic Structure of the BaFe${}_2$As${}_2$ Family of Iron Pnictides
• Electronic structure of heavily electron-doped BaFe${}_{1.7}$Co${}_{0.3}$As${}_2$ studied by angle-resolved photoemission
• Do Transition Metal Substitutions Dope Carriers in Iron Based Superconductors?
• Evidence for Three-Dimensionality in the Fermi Surface Topology of Layered Electron Doped Ba(Fe1-XCox)2As2 Iron Superconductors
• Nesting between hole and electron pockets in Ba(Fe1-xCox)2As2 (x=0-0.3) observed with angle-resolved photoemission
• The orbital characters of bands in iron-based superconductor BaFe1.85Co0.15As2
• Dependence of carrier doping on the impurity potential in transition-metal-substituted FeAs-based superconductors
• Electron-Hole Asymmetry in Superconductivity of Pnictides Originated from the Observed Rigid Chemical Potential Shift
• Polaron Coherence Condensation as the Mechanism for Colossal Magnetoresistance in Layered Manganites
• Gutzwiller density functional calculations of the electronic structure of FeAs-based superconductors: Evidence for a three-dimensional Fermi surface
• Effects of cobalt doping and three-dimensionality in $BaF{e}_{2}A{s}_2$
• Co-substitution effects on the Fe-valence in the BaFe2As2 superconducting compound: A study of hard x-ray absorption spectroscopy
• Probing the role of Co substitution in the electronic structure of iron-pnictides
• The magnetic moment enigma in Fe-based high temperature superconductors
• Observation of charge accumulation and onsite Coulomb repulsion at transition metal impurities in the iron pnictides

Cited by in corpus (3)

• Local breaking of four-fold rotational symmetry by short-range magnetic order in heavily overdoped Ba(Fe${}_{1-x}$Cu${}_x$)${}_2$As${}_2$
• Effect of electron doping in FeTe${}_{1-y}$Se${}_y$ realized by Co and Ni substitution
• Observation of the Dirac Dispersions in Co-doped CaFe2As2