Proposal to determine the Fermi-surface topology of a doped iron-based superconductor using bulk-sensitive Fourier-transform Compton scattering

TL;DR

This paper proposes a method using bulk-sensitive Fourier-transform Compton scattering to determine the Fermi-surface topology in doped iron-based superconductors, specifically identifying the critical doping level where superconductivity is suppressed.

Contribution

It introduces a first-principles calculation approach to detect Fermi-surface changes via Compton scattering spectra, linking spectral signatures to Fermi surface filling and superconductivity suppression.

Findings

Distinct Fourier-transform Compton spectral signatures for hole Fermi surface filling

Identification of the critical doping concentration where superconductivity is suppressed

Demonstration of a bulk-sensitive method for Fermi-surface topology determination

Abstract

We have carried out first-principles calculations of the Compton scattering spectra to demonstrate that the filling of the hole Fermi surface in LaO$_{1-x}$F$_{x}$FeAs produces a distinct signature in the Fourier transformed Compton spectrum when the momentum transfer vector lies along the [100] direction. We thus show how the critical concentration $x_c$, where hole Fermi surface pieces are filled up and the superconductivity mediated by antiferromagnetic spin fluctuations is expected to be suppressed, can be obtained in a bulk-sensitive manner.