Spin-Density-Wave and Asymmetry of Coherence Peaks in iron-Pnictide Superconductors from a two-orbital model

TL;DR

This paper theoretically investigates the coexistence of spin-density-wave and superconductivity in iron-pnictide superconductors using a two-orbital model, revealing how SDW influences coherence peaks and Fermi surface evolution.

Contribution

It introduces a detailed two-orbital model analysis of SDW and superconductivity coexistence, mapping phase diagrams and LDOS changes with doping.

Findings

Superconducting coherence peaks are asymmetrically affected by SDW.

Fermi surface evolution is mapped across doping levels.

Results align with experimental observations.

Abstract

We study theoretically the coexistence of the spin-density-wave (SDW) and superconductivity in electron-doped iron-pnictide superconductors based on the two orbital model and Bogoliubov-de Gennes equations. The phase diagram is mapped out and the evolution of the Fermi surface as the doping varies is presented. The local density of states (LDOS) has also been calculated from low to high doping. We show that the strength of the superconducting coherent peak at the positive energy gets enhanced and the one at the negative energy is suppressed by the SDW order in the underdoped region. Several features of our results are in good agreement with the experiments.