Roles of anisotropic and unequal gaps in the quasiparticle interference of superconducting iron pnictides

Abstract

We investigate the role of gap characteristics such as anisotropy and inequality of the gaps in the quasiparticle interferences of iron pnictides using a five-orbital tight-binding model. We examine how the difference in the sensitivities exhibited by the sign-changing and -preserving $s$-wave superconductivity in an annular region around ($\pi ,0$), which can be used to determine the sign change of the superconducting gap, gets affected when the gaps are unequal on the electron and hole pocket. In addition, we also discuss how robust these differentiating features are on changing the quasiparticle energy or when the gap is anisotropic.

References in corpus (19)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• Multiband magnetism and superconductivity in Fe-based compounds
• Theory of magnetic excitations in iron-based layered superconductors
• Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2
• Momentum dependence of the superconducting gap in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Phase Diagram of Ba1-xKxFe2As2
• Origin of Gap Anisotropy in Spin Fluctuation Models of the Fe-pnictides
• Neutron Scattering Resonance and the Fe-pnictide Superconducting Gap
• Nodes in the Gap Function of LaFePO, the Gap Function of the Fe(Se,Te) Systems, and the STM Signature of the s${}_{\pm }$ Pairing
• Model for nodal quasiparticle scattering in a disordered vortex lattice
• Magnetic field evolution of the quasiparticle interference in a d-wave superconductor
• Robustness of Quasiparticle Interference Test for Sign-changing Gaps in Multiband Superconductors
• Quasiparticle interference in antiferromagnetic parent compounds of Fe-based superconductors

Cited by in corpus (1)

• Quasi-one Dimensional Nanostructures as Sign of Nematicity in Iron Pnictides and Chalcogenides