Analyzing scanning tunneling spectroscopy for Fe-based superconductor Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ and extracting $s$-wave density of states

Abstract

We extract the density of states (DOS) from the scanning tunneling spectroscopy data for Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ superconductor. The obtained sample DOS is composed of two ordinary $s$-wave types from the band at $\Gamma$ point and a linear-like DOS within the $s$-wave gap from the band at M point in the Brillouin zone, and is consistent with the corresponding data from angle-resolved photoemission spectroscopy. We clarify that the major peak of the tunneling conductance is not related to the DOS but is rather the effect of nonequilibrium coherent tunneling including all coherent spins in the tip and sample.

arXiv comment7 pages, 5 figures

References in corpus (20)

• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
• Intra-unit-cell electronic nematicity of the high-Tc copper-oxide pseudogap states
• Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• Energy gaps in high-transition temperature cuprate superconductors
• Nonequilibrium Transport in Quantum Impurity Models (Bethe-Ansatz for open systems)
• On steady-state currents through nano-devices: a scattering-states numerical renormalization group approach to open quantum systems
• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
• Unconventional Anisotropic s-Wave Superconducting Gaps of LiFeAs Iron-Pnictide Superconductor
• A perturbative nonequilibrium renormalization group method for dissipative quantum mechanics: Real-time RG in frequency space (RTRG-FS)
• Momentum-dependence of Superconducting Gap, strong-coupling dispersion Kink, and tightly bound Cooper pairs in the high-Tc (Sr,Ba)1-x(K,Na)xFe2As2 superconductors
• Tightly-bound Cooper pair, quasiparticle kinks and clues on the pairing potential in a high Tc FeAs Superconductor
• Extending Universal Nodal Excitations Optimizes Superconductivity in Bi2Sr2CaCu2O8+d
• Perturbative Approach to the Nonequilibrium Kondo Effect in a Quantum Dot
• Imaginary-time formulation of steady-state nonequilibrium: application to strongly correlated transport
• Scanning tunneling spectroscopy of superconducting LiFeAs single crystals: Evidence for two nodeless energy gaps and coupling to a bosonic mode
• Superconducting Properties of the $s^{\pm }$-wave state: Fe-based superconductors
• On the Zero-Bias Anomaly in Quantum Wires
• A universal explanation of tunneling conductance in exotic superconductors