The electronic structure of CeCoIn5 from angle-resolved photoemission spectroscopy I: Comparison to LDA

TL;DR

This study uses angle-resolved photoemission spectroscopy and band structure calculations to analyze the electronic structure of CeCoIn5, revealing its quasi-two-dimensional Fermi surface and discussing the nature of 4f electrons.

Contribution

It provides a detailed comparison between experimental ARPES data and LDA calculations, exploring the localization or itinerancy of 4f electrons in CeCoIn5.

Findings

Fermi surface is quasi-two-dimensional with sheets at the M-A line

Band structure calculations show differences based on 4f electron treatment

Implications for the nature of 4f electrons at 25 K

Abstract

We have investigated the low-energy electronic structure of the heavy fermion superconductor CeCoIn5 by angle-resolved photoemission and band structure calculations. We measured the Fermi surface and energy distribution maps along the high-symmetry directions at hn = 100 eV and T = 25 K. The compound has quasi two-dimensional Fermi surface sheets centered at the M-A line of the Brillouin zone. The band structure calculations have been carried out within the local density approximation where the 4f electrons have been treated either localized or itinerant. We discuss the comparison to the experimental data and the implications for the nature of the 4f electrons at the given temperature.