Effect of transition-metal substitution in iron-based superconductors

Abstract

We study theoretically the current debatable issue about the effect of transition-metal (TM) substitution in iron-based superconductors through treating all of the TM ions as randomly distributed impurities. The extra electrons from TM elements are localized at the impurity sites. In the mean time the chemical potential shifts upon substitution. The phase diagram is mapped out and it seems that the TM elements can act as effective dopants. The local density of states (LDOS) is calculated and the bottom becomes V-shaped as the impurity concentration increases. The LDOS at the Fermi energy $\rho (\omega =0)$ is finite and reaches the minimum at the optimal doping level. Our results are in good agreement with the scanning tunneling microscopy experiments.

5 pages, 4 figures

References in corpus (15)

• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Determination of the phase diagram of the electron doped superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
• Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron-Pnictide Superconductor BaFe${}_{1.8}$Co${}_{0.2}$As${}_2$
• NMR relaxation rate in superconducting pnictides: extended $s_{\pm }$ scenario
• Where Are the Extra d Electrons in Transition-Metal Substituted Fe Pnictides?
• Superfluid density of the $\pm$s-wave state for the iron-based 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
• Superfluid density and penetration depth in Fe-pnictides
• Effects of cobalt doping and three-dimensionality in $BaF{e}_{2}A{s}_2$
• Measurement of a Sign-Changing Two-Gap Superconducting Phase in Electron-Doped Ba(Fe_{1-x}Co_x)_2As_2 Single Crystals using Scanning Tunneling Spectroscopy
• Quasiparticle states around a nonmagnetic impurity in electron-doped iron-based superconductors with spin-density-wave order
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores

Cited by in corpus (3)

• Probing the role of Co substitution in the electronic structure of iron-pnictides
• Electronic structure of single-crystalline Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ probed by x-ray absorption spectroscopy: Evidence for isovalent substitution of Fe${}^{2+}$ by Co${}^{2+}$
• The electronic structure of Co-substituted $\text{Fe}\text{Se}$ superconductor probed by soft X-ray spectroscopy and density functional theory