Evidence for Three-Dimensionality in the Fermi Surface Topology of Layered Electron Doped Ba(Fe1-XCox)2As2 Iron Superconductors

TL;DR

This study uses ARPES to demonstrate the three-dimensional Fermi surface topology in electron-doped Ba(Fe1-xCox)2As2 superconductors, highlighting their distinct electronic structure compared to cuprates.

Contribution

It provides direct experimental evidence of three-dimensional Fermi surface features in layered iron-based superconductors, a novel insight into their electronic structure.

Findings

Photon energy dependence indicates 3D Fermi surface topology

Distinct electronic structure from cuprate superconductors

High temperature superconductivity in layered compounds with 3D electronic features

Abstract

The electronic structure of electron doped iron-arsenide superconductors Ba(Fe1- xCox)2As2 has been measured with Angle Resolved Photoemission Spectroscopy. The data reveal a marked photon energy dependence of points in momentum space where the bands cross the Fermi energy, a distinctive and direct signature of three-dimensionality in the Fermi surface topology. By providing a unique example of high temperature superconductivity hosted in layered compounds with three-dimensional electronic structure, these findings suggest that the iron-arsenides are unique materials, quite different from the cuprates high temperature superconductors.