Theory of Mixed-State Effect on Quasiparticle Interference in Iron-based Superconductors

Abstract

Based on a phenomenological model with $s_{\pm }$ or s-wave pairing symmetry, the mixed-state effect on quasiparticle interference in iron-based superconductors is investigated by solving large-scale Bogoliubov-de Gennes equations based on the Chebyshev polynomial expansion. Taking into account the presence of magnetic field, our result for the $s_{\pm }$ pairing is in qualitative agreement with recent scanning tunneling microscopy experiment while for the s-wave pairing, the result is in apparent contradiction with experimental observations, thus excluding the s-wave pairing. Furthermore, we treat the effect of vortices rigorously instead of approximating the vortices as magnetic impurities, thus our results are robust and should be more capable of explaining the experimental data.

References in corpus (20)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• The Kernel Polynomial Method
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Multiband magnetism and superconductivity in Fe-based compounds
• Theory of magnetic excitations in iron-based layered superconductors
• Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6
• Evidence for nodal superconductivity in LaFePO
• Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by angle-resolved photoemission spectroscopy
• Neutron scattering as a probe of the Fe-pnicitide superconducting gap
• Three-dimensional Resonance in superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• Scanning Tunneling Microscopy/Spectroscopy of Vortices in LiFeAs
• Momentum dependence and nodes of the superconducting gap in iron-pnictides
• Observation of Lattice and Andreev Bound States of Vortices in Ba0.6K0.4Fe2As2 Single Crystals with Scanning Tunneling Microscopy/Spectroscopy
• Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe0.55Se0.45
• Chebyshev-BdG: an efficient numerical approach to inhomogeneous superconductivity
• Efficient Numerical Self-consistent Mean-field Approach for Fermionic Many-body Systems by Polynomial Expansion on Spectral Density
• Neutron-Inelastic-Scattering Peak by Dissipationless Mechanism in the s++ -wave State in Iron-based Superconductors
• Quasiparticle interference in an iron-based superconductor
• Impurity-induced quasiparticle interference in the parent compounds of iron-pnictide superconductors
• Direct Numerical Demonstration of Sign-preserving Quasiparticle Interference via Impurity inside Vortex Core in Unconventional Superconductors

Cited by in corpus (6)

• GPU-based acceleration of free energy calculations in solid state physics
• Probe-type of superconductivity by impurity in materials with short coherence length: the s-wave and $\eta$-wave phases study
• Quasiparticle Interference in Fe-based Superconductors Based on a Five-Orbital Tight-Binding Model
• Signatures of nodeless multiband superconductivity and particle-hole crossover in the vortex cores of FeTe${}_{0.55}$Se${}_{0.45}$
• Robust $s_{\pm }$-wave superconductivity against multi-impurity in iron-based superconductors
• Mixed-State Effect on the Low-Energy Spin Dynamics in Optimally-doped Iron Pnictide Superconductors