Effects of single- and multi-substituted Zn ions in doped-122 type iron-based superconductors
arXiv:1604.01323 · doi:10.1103/PhysRevB.93.144510
Abstract
Recent experiments on Zn-substituted 122-type iron-based superconductors (FeSCs) at electron- and hole- doped region provide us with a testing ground for understanding the effect of Zn impurities in these systems. Our first-principle calculations of the electronic structure reveal that the Zn 3d orbitals are far below the Fermi level and chemically inactive, while the Zn 4s-orbital is partially occupied and its wave function overlapping with those 3d-orbitals of neighboring Fe-ions. This suggests that the impurity effect is originating in the Zn 4s-orbital, not its 3d-orbitals. Employing a phenomenological two-orbital lattice model for 122-FeSCs and the self-consistent Bogoliubov-de Gennes equations, we study how the Zn-impurities suppress the superconductivity in electron- and hole- doped compounds. Our obtained results qualitatively agree with the experimental measurements.
arXiv commentAccepted for publication in Phys. Rev. B
References in corpus (33)
- Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
- Unconventional sign-reversing superconductivity in 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
- Pnictogen height as a possible switch between high-T_c nodeless and low-T_c nodal pairings in the iron based superconductors
- A minimal two-band model for the superconducting Fe-pnictides
- Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
- A Numerical Renormalization Group Study of the Superconducting and Spin Density Wave Instabilities in MFeAsOF Compounds
- Competition and coexistence of antiferromagnetism and superconductivity in underdoped Ba(Fe0.953Co0.047)2As2
- Superconductivity induced by Ni doping in BaFeAs
- Violation of Anderson's Theorem for Sign-Reversing s-Wave State of Iron-Pnictide Superconductors
- Phase Diagram of Ba1-xKxFe2As2
- Magnetically-Driven Suppression of Nematic Order in an Iron-Based Superconductor
- Fingerprints of spin-orbital physics in cubic Mott insulators: Magnetic exchange interactions and optical spectral weights
- Where Are the Extra d Electrons in Transition-Metal Substituted Fe Pnictides?
- Superfluid density of the s-wave state for the iron-based superconductors
- Resonant impurity scattering in the s-gap state of the Fe-based superconductors
- Do Transition Metal Substitutions Dope Carriers in Iron Based Superconductors?
- Nonmagnetic Impurity Resonances as a Signature of Sign-Reversal Pairing in the FeAs-based Superconductors
- Nodes in the Gap Function of LaFePO, the Gap Function of the Fe(Se,Te) Systems, and the STM Signature of the s Pairing
- Symmetric Microscopic Model for Iron-Based Superconductors
- Linear decrease of critical temperature with increasing Zn substitution in the iron-based superconductor BaFe1.89-2xZn2xCo0.11As2
- Theory of Multiband Superconductivity in Iron Pnictides
- Quasiparticle states around a nonmagnetic impurity in electron-doped iron-based superconductors with spin-density-wave order
- Zn-impurity effect and interplay of - and -pairings in Fe-based superconductors
- Disorder effects in multiorbital -wave superconductors: Implications for Zn-doped BaFeAs compounds
- Inter-layer Superconducting Pairing Induced c-axis Nodal Lines in Iron-based Superconductors
- Phase diagram of doped BaFeAs superconductor under broken symmetry
- Domain Walls in Normal and Superconducting States of Iron Pnictides
- Effects of Zn substitution on the electronic structure of BaFeAs revealed by angle-resolved photoemission spectroscopy
- Fermi surfaces and Phase Stability of Ba(FeM)As (M=Co, Ni, Cu, Zn)
- Evolution of quasiparticle states with and without a Zn-impurity in doped 122 iron pnictides
- Phase diagram of the isovalent phosphorous-substituted 122-type iron pnictides