Single vortex structure in two models of iron pnictide $s^{\pm }$ superconductivity

Abstract

The structure of a single vortex in a FeAs superconductor is studied in the framework of two formulations of superconductivity for the recently proposed sign-reversed $s$ wave ($s^{\pm }$) scenario: {\it (i)} a continuum model taking into account the existence of an electron and a hole band with a repulsive local interaction between the two; {\it (ii)} a lattice tight-binding model with two orbitals per unit cell and a next-nearest-neighbour attractive interaction. In the first model, the local density of states (LDOS) at the vortex centre, as a function of energy, exhibits a peak at the Fermi level, while in the second model such LDOS peak is deviated from the Fermi level and its energy depends on band filling. An impurity located outside the vortex core has little effect on the LDOS peak, but an impurity close to the vortex core can almost suppress it and modify its position.

17 pages, 15 figures. Accepted for publication in New Journal of Physics

References in corpus (28)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Scanning tunneling spectroscopy of high-temperature superconductors
• 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 ?
• Correlated electronic structure of LaOFeAs
• A minimal two-band model for the superconducting Fe-pnictides
• The BCS-like gap in superconductor SmFeAsO_0.85F_0.15
• Multiband magnetism and superconductivity in Fe-based compounds
• Theory of magnetic excitations in iron-based layered superconductors
• Vortex Imaging in the pi-Band of Magnesium Diboride
• Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron-Pnictide Superconductor BaFe${}_{1.8}$Co${}_{0.2}$As${}_2$
• Doping-dependent Phase Diagram of LaO{\it M}As ({\it M}=V--Cu) and Electron-type Superconductivity near Ferromagnetic Instability
• Spin-triplet p-wave pairing in a 3-orbital model for iron pnictide superconductors
• Spin Fluctuations, Interband Coupling, and Unconventional Pairing in Iron-based Superconductors
• Quasiparticle Heat Transport in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$: Evidence for a k-dependent Superconducting Gap without Nodes
• Possible pairing states of the Fe-based superconductors
• Nodal Superconductivity with Multiple Gaps in SmFeAsO${}_{0.9}$F${}_{0.1}$
• Magnetic field delocalization and flux inversion in fractional vortices in two-component superconductors
• Quantum waveguide theory of Andreev reflection in multiband superconductors: the case of Fe-pnictides
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores
• Nodal Gap in Fe-Based Layered Superconductor LaO_0.9F_{0.1-delta}FeAs Probed by Specific Heat Measurements
• Interplay of disorder and magnetic field in the superconducting vortex state
• Local quasiparticle lifetimes in a d-wave superconductor
• Confinement of monopole field lines in a superconductor at T=/=0
• Anomalous scaling and gapless fermions of d-wave superconductors in magnetic field
• Vortex core states in a minimal two-band model for iron-based superconductors

Cited by in corpus (9)

• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
• Vortex states in hole-doped iron-pnictide superconductors
• Electronic vortex structure of Fe-based superconductors: application to LiFeAs
• Consistent picture for the electronic structure around a vortex core in iron-based superconductors
• Signatures of nodeless multiband superconductivity and particle-hole crossover in the vortex cores of FeTe${}_{0.55}$Se${}_{0.45}$
• Interplay of Fermi velocities and healing lengths in two-band superconductors
• Local spin-density-wave order inside vortex cores in multiband superconductors
• Orbital-resolved vortex core states in FeSe Superconductors: calculation based on a three-orbital model
• Interference Effect of Beam Splitter Current in Iron-Pnictide Superconductors