Vortex as a probe - suggested measurement of the order parameter structure in iron-based superconductors

Abstract

Impurities, inevitably present in all samples, induce elastic transitions between quasiparticle states on the contours of constant energy. These transitions may be seen in Fourier transformed scanning tunneling spectroscopy experiments, sorted by their momentum transfer. In a superconductor, anomalous scattering in the pairing channel may be introduced by magnetic field. When a magnetic field is applied, vortices act as additional sources of scattering. These additional transition may enhance or suppress the impurity-induced scattering. We find that the vortex contribution to the transitions is sensitive to the momentum-space structure of the pairing function. In the iron-based superconductors there are both electron and hole pockets at different regions of the Brillouin zone. Scattering processes therefore represent intrapocket or interpocket transitions, depending on the momentum transfer in the process. In this work we show that while in a simple s-wave superconductors all transitions are enhanced by vortex scattering, in an s+- superconductor only intra-pocket transitions are affected. We suggest this effect as a probe for the existence of the sign change of the order parameter.

7 pages, 4 figures

References in corpus (21)

• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• A minimal two-band model for the superconducting Fe-pnictides
• Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
• Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
• Evolution from Itinerant Antiferromagnet to Unconventional Superconductor with Fluorine Doping in La(O_{1-x}F_{x})FeAs Revealed by ^{75}As and ^{139}La Nuclear Magnetic Resonance
• ${}^{75}$As NMR studies of superconducting LaO${}_{0.9}$F${}_{0.1}$FeAs
• Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron-Pnictide Superconductor BaFe${}_{1.8}$Co${}_{0.2}$As${}_2$
• Microwave Penetration Depth and Quasiparticle Conductivity in PrFeAsO_1-y Single Crystals : Evidence for a Full-Gap Superconductor
• Spin-singlet superconductivity with multiple gaps in PrO0.89F0.11FeAs
• Evidence for nodal superconductivity in LaFePO
• Multiple Nodeless Superconducting Gaps in (Ba0.6K0.4)Fe2As2 Superconductor from Angle-Resolved Photoemission Spectroscopy
• Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry
• Valley density-wave and multiband superconductivity in Fe-pnictides
• Magnetic penetration depth of single crystal SmFeAsO_{1-x}F_y: a fully gapped superconducting state
• Two superconducting gaps in LaFeAsO0.92F0.08 revealed by 75As nuclear quadrupole resonance
• Impurity-induced bound states in iron-based superconductors with s-wave cos(kx)cos(ky) pairing symmetry
• Quasiparticle Scattering Interference in Superconducting Iron-pnictides
• Is Fermi-surface nesting the origin of superconductivity in iron pnictides?: A fluctuation-exchange-approximation study
• Experimental Detection of Sign-Reversal Pairing in Iron-Based Superconductors
• Magnetic field evolution of the quasiparticle interference in a d-wave superconductor
• Quasiparticle interference patterns as a test for the nature of the pseudogap phase in the cuprate superconductors

Cited by in corpus (11)

• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
• Measurement of a Sign-Changing Two-Gap Superconducting Phase in Electron-Doped Ba(Fe_{1-x}Co_x)_2As_2 Single Crystals using Scanning Tunneling Spectroscopy
• Quasiparticle interference in iron-based superconductors
• Quasiparticle interference in an iron-based superconductor
• Impurity-induced quasiparticle interference in the parent compounds of iron-pnictide superconductors
• Consistent picture for the electronic structure around a vortex core in iron-based superconductors
• Quasiparticle Interference in Fe-based Superconductors Based on a Five-Orbital Tight-Binding Model
• Theory of Mixed-State Effect on Quasiparticle Interference in Iron-based Superconductors
• Quasiparticle Interference Patterns in a Topological Superconductor
• Effect of transition-metal substitution in iron-based superconductors
• Signatures of the order parameter of a superconducting adatom layer in magnetic field dependent quasiparticle interference