Dependence of carrier doping on the impurity potential in transition-metal-substituted FeAs-based superconductors

Abstract

In order to examine to what extent the rigid-band-like electron doping scenario is applicable to the transition metal-substituted Fe-based superconductors, we have performed angle-resolved photoemission spectroscopy studies of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ (Ni-122) and Ba(Fe${}_{1-x}$Cu${}_x$)${}_2$As${}_2$ (Cu-122), and compared the results with Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ (Co-122). We find that Ni 3$d$-derived features are formed below the Fe 3$d$ band and that Cu 3$d$-derived ones further below it. The electron and hole Fermi surface (FS) volumes are found to increase and decrease with substitution, respectively, qualitatively consistent with the rigid-band model. However, the total extra electron number estimated from the FS volumes (the total electron FS volume minus the total hole FS volume) is found to decrease in going from Co-, Ni-, to Cu-122 for a fixed nominal extra electron number, that is, the number of electrons that participate in the formation of FS decreases with increasing impurity potential. We find that the N$\acute{\mathrm{e}}$el temperature $T_{\mathrm{N}}$ and the critical temperature $T_c$ maximum are determined by the FS volumes rather than the nominal extra electron concentration nor the substituted atom concentration.

Total: 9 pages, 10 figures

References in corpus (13)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Electronic Structure and Doping in BaFe${}_2$As${}_2$ and LiFeAs: Density Functional Calculations
• Superconductivity induced by Ni doping in BaFe${}_2$As${}_2$
• Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by angle-resolved photoemission spectroscopy
• Where Are the Extra d Electrons in Transition-Metal Substituted Fe Pnictides?
• Resonant and crossover phenomena in a multiband superconductor tuning the chemical potential near a band edge
• Momentum-dependence of Superconducting Gap, strong-coupling dispersion Kink, and tightly bound Cooper pairs in the high-Tc (Sr,Ba)1-x(K,Na)xFe2As2 superconductors
• Importance of Fermi surface topology for high temperature superconductivity in electron-doped iron arsenic superconductors
• Electronic structure of heavily electron-doped BaFe${}_{1.7}$Co${}_{0.3}$As${}_2$ studied by angle-resolved photoemission
• Electron-Hole Asymmetry in Superconductivity of Pnictides Originated from the Observed Rigid Chemical Potential Shift

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