Electronic structure of NiS$_{1-x}$Se$_x$ across the phase transition

TL;DR

This study uses high-resolution photoemission spectroscopy to investigate the electronic structure of NiS$_{1-x}$Se$_x$ across the metal-insulator transition, revealing the metallic nature of the low-temperature antiferromagnetic phase and possible gap openings due to magnetic ordering.

Contribution

It provides detailed spectroscopic evidence clarifying the electronic behavior of NiS$_{1-x}$Se$_x$ during the phase transition, highlighting the role of magnetic ordering.

Findings

Low-temperature phase is metallic with reduced density of states at E_F

Possible gap openings along specific Brillouin zone directions due to antiferromagnetic order

Spectroscopic evidence supports the metallic nature of the antiferromagnetic phase

Abstract

We report very highly resolved photoemission spectra of NiS(1-x)Se(x) across the so-called metal-insulator transition as a function of temperature as well as composition. The present results convincingly demonstrate that the low temperature, antiferromagnetic phase is metallic, with a reduced density of states at E$_F$. This decrease is possibly due to the opening of gaps along specific directions in the Brillouin zone caused by the antiferromagnetic ordering.