Vortex state in iron-based superconductors with collinear antiferromagnetic cores

Abstract

Magnetism in the FeAs stoichiometric compounds and its interplay with superconductivity in vortex states are studied by self-consistently solving the BdG equations based on a two-orbital model with including the on-site interactions between electrons in the two orbitals. It is revealed that for the parent compound, magnetism is caused by the strong Hund's coupling, and the Fermi surface topology aids to select the spin-density-wave (SDW) pattern. The superconducting (SC) order parameter with $s_{\pm }={\Delta }_0\cos (k_x)\cos (k_y)$ symmetry is found to be the most favorable pairing for both the electron- and hole-doped cases, while the local density-of-states (LDOS) exhibits the characteristic of nodal gap for the former and full gap for the latter. In the vortex state, the emergence of the field-induced SDW depends on the strength of the Hund's coupling and the Coulomb repulsions. The field-induced SDW gaps the finite energy contours on the electron and hole pocket sides, leading to the dual structures with one reflecting the SC pairing and the other being related to the SDW order. These features can be discernable in STM measurements for identifying the interplay between the field-induced SDW order and the SC order around the core region.

8 pages

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Cited by in corpus (15)

• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
• Impurity and vortex States in the bilayer high-temperature superconductor ${\mathrm{La}}_3{\mathrm{Ni}}_2{\mathrm{O}}_7$
• Anisotropic vortex lattice structures in the FeSe superconductor
• Vortex states in hole-doped iron-pnictide superconductors
• Spin-Density-Wave and Asymmetry of Coherence Peaks in iron-Pnictide Superconductors from a two-orbital model
• Quasiparticle states around a nonmagnetic impurity in electron-doped iron-based superconductors with spin-density-wave order
• Electronic vortex structure of Fe-based superconductors: application to LiFeAs
• Consistent picture for the electronic structure around a vortex core in iron-based superconductors
• Single vortex structure in two models of iron pnictide $s^{\pm }$ superconductivity
• Signatures of nodeless multiband superconductivity and particle-hole crossover in the vortex cores of FeTe${}_{0.55}$Se${}_{0.45}$
• Effects of the vortices and impurities on the nuclear spin relaxation rate in iron-based superconductors
• Signatures of unconventional pairing in near-vortex electronic structure of LiFeAs
• Local spin-density-wave order inside vortex cores in multiband superconductors
• Effect of transition-metal substitution in iron-based superconductors
• Mixed-State Effect on the Low-Energy Spin Dynamics in Optimally-doped Iron Pnictide Superconductors