Properties of a diagonal 2-orbital ladder model of the Fe-pnictide superconductors

TL;DR

This study uses the density matrix renormalization group to analyze a diagonal 2-orbital ladder model of Fe-based superconductors, revealing competing magnetic states, nematic correlations, and dominant S-wave pairing upon doping.

Contribution

It introduces a detailed analysis of a diagonal 2-orbital ladder model, highlighting magnetic competition and pairing symmetry in Fe-based superconductors.

Findings

Competition between spin-striped and spin-checkerboard states at half filling

Presence of significant nematic correlations

Dominant S-wave pairing correlations upon doping

Abstract

We study a diagonal 2-orbital ladder model of the Fe based superconductors using the density matrix renormalization group method. At half filling, we find a close competition between a "spin-striped" state and a non-collinear "spin-checkerboard" state, as well as significant nematic correlations. Upon finite hole or electron doping, the dominant pairing correlations are found to have A$_{1,g}$ ($S-$wave) symmetry.