Impurity-induced smearing of the spin resonance peak in Fe-based superconductors

Abstract

The spin resonance peak in the iron-based superconductors is observed in inelastic neutron scattering experiments and agrees well with predicted results for the extended s-wave ($s_{\pm }$) gap symmetry. On the basis of four-band and three-orbital tight binding models we study the effect of nonmagnetic disorder on the resonance peak. Spin susceptibility is calculated in the random phase approximation with the renormalization of the quasiparticle self-energy due to the impurity scattering in the static Born approximation. We find that the spin resonance becomes broader with the increase of disorder and its energy shifts to higher frequencies. For the same amount of disorder the spin response in the $s_{\pm }$ state is still distinct from that of the $s_{++}$ state.

arXiv comment4 pages, 2 figures

References in corpus (21)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• Gap symmetry and structure of Fe-based superconductors
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Orbital Fluctuation Mediated Superconductivity in Iron Pnictides: Analysis of Five Orbital Hubbard-Holstein Model
• Theory of magnetic excitations in iron-based layered superconductors
• High - Temperature Superconductivity in Iron Based Layered Compounds
• Iron based superconductors: magnetism, superconductivity and electronic structure
• Neutron scattering as a probe of the Fe-pnicitide superconducting gap
• Disorder induced transition between s_+- and s_++ states in two-band superconductors
• Electronic Structure of Prototype AFe_2As_2 and ReOFeAs High-Temperature Superconductors: a Comparison
• Impact of the 2 Fe unit cell on the electronic structure measured by ARPES in iron pnictides
• Electronic Structure of New LiFeAs High-Tc Superconductor
• Anisotropic Neutron Spin Resonance in Superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• Electronic theory for the normal state spin dynamics in Sr${}_2$RuO${}_4$: anisotropy due to spin-orbit coupling
• Superconducting state in Fe-based materials and spin-fluctuation theory of pairing
• Unexpected impact of magnetic disorder on multiband superconductivity
• Anisotropic quasiparticle lifetimes in Fe-based superconductors
• Anomalous proximity effects at the interface of s and s+- superconductors
• Electronic structure and de Haas-van Alphen frequencies in KFe2As2 within LDA+DMFT
• Effect of nodes, ellipticity and impurities on the spin resonance in Iron-based superconductors