Doping-Dependent and Orbital-Dependent Band Renormalization in Ba(Fe_1-xCo_x)_2As_2 Superconductors

Abstract

Angle resolved photoemission spectroscopy of Ba(Fe1-xCox)2As2 (x = 0.06, 0.14, and 0.24) shows that the width of the Fe 3d yz/zx hole band depends on the doping level. In contrast, the Fe 3d x^2-y^2 and 3z^2-r^2 bands are rigid and shifted by the Co doping. The Fe 3d yz/zx hole band is flattened at the optimal doping level x = 0.06, indicating that the band renormalization of the Fe 3d yz/zx band correlates with the enhancement of the superconducting transition temperature. The orbital-dependent and doping-dependent band renormalization indicates that the fluctuations responsible for the superconductivity is deeply related to the Fe 3d orbital degeneracy.

5 pages, 4 figures

References in corpus (20)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Orbital Fluctuation Mediated Superconductivity in Iron Pnictides: Analysis of Five Orbital Hubbard-Holstein Model
• Electronic Structure and Doping in BaFe${}_2$As${}_2$ and LiFeAs: Density Functional Calculations
• Fermi surface nesting induced strong pairing in iron-based superconductors
• Orbitally-driven Peierls state in spinels
• The Fermi surface of Ba(1-x)K(x)Fe2As2 and its evolution with doping
• (pi,pi)-electronic order in iron arsenide superconductors
• Where Are the Extra d Electrons in Transition-Metal Substituted Fe Pnictides?
• Electronic structure of heavily electron-doped BaFe${}_{1.7}$Co${}_{0.3}$As${}_2$ studied by angle-resolved photoemission
• Evidence for Three-Dimensionality in the Fermi Surface Topology of Layered Electron Doped Ba(Fe1-XCox)2As2 Iron Superconductors
• Possible superconductivity above 25 K in single crystalline Co-doped BaFe${}_2$As${}_2$
• Evidence of local structural inhomogeneity in FeSe(1-x)Te(x) from extended x-ray absorption fine structure
• Correlation effects of exchange splitting and coexistence of spin-density-wave and superconductivity in single crystalline Sr1-xKxFe2As2
• Orbital character variation of the Fermi surface and doping dependent changes of the dimensionality in BaFe2-xCoxAs2 from angle-resolved photoemission spectroscopy
• Three-dimensional electronic structure of superconducting iron pnictides observed by angle-resolved photoemission spectroscopy
• Coupling of spin and orbital excitations in the iron-based superconductor FeSe(0.5)Te(0.5)
• Doping Dependence of Spin Dynamics in Electron-Doped Ba(Fe1-xCox)2As2
• Single-crystal growth of the ternary BaFe${}_2$As${}_2$ phase using the vertical Bridgman technique

Cited by in corpus (10)

• Electronic correlations in Hund metals
• Many-body effects in iron pnictides and chalcogenides -- non-local vs dynamic origin of effective masses
• Hundness versus Mottness in a three-band Hubbard-Hund model: On the origin of strong correlations in Hund metals
• Experimental Observation of Incoherent-Coherent Crossover and Orbital Dependent Band Renormalization in Iron Chalcogenide Superconductors
• Optical conductivity of iron-based superconductors
• Low-energy interband transitions in the infrared response of Ba(Fe1-xCox)2As2
• Correlation, doping and interband effects on the optical conductivity of iron superconductors
• Coupling of the A_{1g} As-phonon to magnetism in iron pnictides
• Transmittance and reflectance measurements at terahertz frequencies on a superconducting BaFe_{1.84}Co_{0.16}As_2 ultrathin film: an analysis of the optical gaps in the Co-doped BaFe_2As_2 pnictide
• Coexistence of Bloch electrons and glassy electrons in Ca10(Ir4As8)(Fe2_xIrxAs2)5 revealed by angle-resolved photoemission spectroscopy