Identification of the surface features in the electronic structure of Cr

TL;DR

This study investigates the electronic structure of Cr(110) films, revealing surface and bulk features, temperature-dependent oxygen bonding, and a correlation-induced sharp feature near the Fermi level.

Contribution

It provides new insights into the surface and bulk electronic features of Cr films, including temperature effects and correlation phenomena, using photoemission spectroscopy.

Findings

Surface and bulk electronic features identified.

Oxygen forms covalent bonds at high temperatures.

A sharp feature near the Fermi level appears at low temperatures.

Abstract

We studied the electronic structure of high quality Cr(110) films grown on W(110) surface employing photoemission spectroscopy. Experiments on the differently aged samples revealed distinct signatures of the surface and bulk features in the electronic structure. It is observed that the adsorbed oxygens form covalent bonds with the surface Cr atoms at higher temperatures, while they remain almost unreacted at low temperatures. In addition to the spin density wave transition induced band folding across the bulk Neel temperature, we discover a weakly dispersing sharp feature emerging near the Fermi level at low temperatures presumably due to correlation induced effects.