Linkage between scattering rates and superconductivity in doped ferropnictides

Topological magnetic order and superconductivity in EuRbFe4As4

“…9). There are clear differences in the dispersion between the inner and the middle hole pockets, similar to other electron and hole doped ferropnictides, and related compounds [103][104][105][106][107][108][109]. The effective mass of the inner hole pocket is ≈30 percent smaller than that of the middle hole pocket.…”

About two-dimensional fits for the analysis of the scattering rates and renormalization functions from angle-resolved photoelectron spectroscopy data

“…The advantage of AAO approach is particularly visible for ARPES data close close to the top/bottom of a hole/electron pocket and close to the edge of the superconducting gap. In particular, we emphasize that with our new method, also the energy dependence of parameters, such as the scattering rate, the dispersion (not shown) or the renormalization function [23] can be determined without knowing or modeling their energy dependence before. We believe that our proposition can be useful for further studies of novel quantum materials.…”

“…We assume here, that the renormalization function can be approximated by a linear function in energy, i.e., there is an energy-dependent amplitude Z = a 0 + a 1 ω. Such a energy dependence of the renormalization function Z(E), is visible in ARPES spectral function of materials and provides important information about the correlation effects [23].…”

“…Electronic correlations are considered as a crucial factor for superconductivity in iron-based pnictides and chalcogenides. They can lead to the strong renormal- [23]. The data collected along Γ-M direction are shown in Fig.…”

“…Such a large value suggests that a normal state of this material is highly incoherent. This topic and the relation between scattering rates and transition temperature T c are discussed in detail elsewhere [23]. The elastic scattering at E F amounts to Γ el (0) = 47(1) meV.…”