Inverse photoemission spectroscopic studies on phase separated La$_{0.2}$Sr$_{0.8}$MnO$_{3}$

TL;DR

This study investigates the temperature-dependent unoccupied electronic states of phase separated La$_{0.2}$Sr$_{0.8}$MnO$_{3}$ using inverse photoemission spectroscopy and theoretical calculations, revealing insights into its electronic structure and phase behavior.

Contribution

It combines experimental inverse photoemission data with band structure calculations to elucidate the unoccupied states in phase separated manganite, highlighting the role of chemical potential shifts.

Findings

Increased intensity near the Fermi level in the insulating phase.

Better match with local moment disorder calculations.

Importance of unoccupied states in understanding phase separation.

Abstract

We have studied the temperature evolution of the inverse photoemission spectra of phase separated La$_{0.2}$Sr$_{0.8}$MnO$_{3}$. To identify the features in the room temperature experimental spectra, band structure calculations using Korringa-Kohn-Rostoker Green's function method were carried out. We find that the features generated by local moment disorder calculations give a better match with the experimental spectrum. In the insulating phase, we observed unusually an increased intensity at around the Fermi level. This puzzling behaviour is attributed to the shift in the chemical potential towards the conduction band. The present results clearly show the importance of unoccupied electronic states in better understanding of the phase separated systems.