Non-uniform doping across the Fermi surface of NbS$_2$ intercalates

TL;DR

This study uses angle-resolved photoelectron spectroscopy to reveal non-uniform doping across the Fermi surface in NbS2 intercalates, affecting their magnetic properties and Fermi surface nesting.

Contribution

It provides the first detailed investigation of Fermi surface topology and valence band structure in Mn and Ni intercalated NbS2 using ARPES, highlighting non-uniform doping effects.

Findings

Charge transfer causes non-uniform Fermi surface doping.

Doping is pocket selective, not uniform.

Implications for Fermi surface nesting and magnetic ordering.

Abstract

Magnetic ordering of the first row transition metal intercalates of NbS$_2$ due to coupling between the conduction electrons and the intercalated ions has been explained in terms of Fermi surface nesting. We use angle-resolved photoelectron spectroscopy to investigate the Fermi surface topology and the valence band structure of the quasi-two-dimensional layer compounds Mn$_{1/3}$NbS$_2$ and Ni$_{1/3}$NbS$_2$. Charge transfer from the intercalant species to the host layer leads to non-uniform, pocket selective doping of the Fermi surface. The implication of our results on the nesting properties are discussed.