Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials

Abstract

Spin resonance in the superconducting state of Fe-based materials within the multiorbital model with unequal anisotropic gaps on different Fermi surface sheets is studied. On the basis of the model gap function and the one calculated within the spin fluctuation theory of pairing, I show that the resonance peak shifts to higher frequencies with increasing the zero-amplitude gap magnitude. On the contrary, with increasing the gap anisotropy, it shifts to lower frequencies and lose some intensity.

published version, 9 pages + 3 pages supplementary materials

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• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• Analysis of the London penetration depth in Ni-doped CaKFe4As4
• Electron and Superconducting Properties of the AFeAs (A= Li, Na) Family Alkali-Metal Pnictides: Current Stage of the Research (mini-review)
• Observation of a neutron spin resonance in the bilayered superconductor CsCa2Fe4As4F2
• Fluctuations and pairing in Fe-based superconductors: Light scattering experiments
• Superconducting Order Parameter and Bosonic Mode in Hydrogen-Substituted NdFeAsO${}_{0.6}$H${}_{0.36}$ Revealed by Multiple Andreev Reflection Spectroscopy
• Self-energy driven resonance-like inelastic neutron spectrum in $s_{++}$-wave state in Fe-based superconductors
• Superconducting Order Parameters in overdoped BaFe${}_{1.86}$Ni${}_{0.14}$As${}_2$ Revealed by Multiple Andreev Reflection Spectroscopy of Planar Break-Junctions
• Direct observation of the spin exciton in Andreev spectroscopy of iron-based superconductors
• Effect of the additional Se layer on the electronic structure of iron-based superconductor FeSe/SrTiO${}_3$
• Thermodynamics of $s_{\pm }-to-s_{++}$ transition in iron pnictides in the vicinity of the Born limit
• Anisotropic superconductivity and Fermi surface reconstruction in the spin-vortex antiferromagnetic superconductor CaK(Fe${}_{0.95}$Ni${}_{0.05}$)${}_4$As${}_4$
• Superconducting order parameter structure in the nematic phase of iron-based materials