Angle-resolved photoemission spectroscopy of perovskite-type transition-metal oxides and their analyses using tight-binding band structure

TL;DR

This paper reviews recent ARPES studies on perovskite-type transition-metal oxides, analyzing their electronic structures with tight-binding calculations, and discusses the effects of magnetic states and electron momentum uncertainty on data interpretation.

Contribution

It provides a comprehensive analysis of ARPES data for various perovskite oxides using empirical tight-binding models, highlighting the importance of bulk versus surface electronic structures.

Findings

Band dispersions in SrVO3 reflect bulk electronic structure

Analysis of LSFO and LSMO assuming different magnetic states

Electron momentum uncertainty affects ARPES interpretation in 3D materials

Abstract

Nowadays it has become feasible to perform angle-resolved photoemission spectroscopy (ARPES) measurements of transition-metal oxides with three-dimensional perovskite structures owing to the availability of high-quality single crystals of bulk and epitaxial thin films. In this article, we review recent experimental results and interpretation of ARPES data using empirical tight-binding band-structure calculations. Results are presented for SrVO$_3$ (SVO) bulk single crystals, and La$_{1-x}$Sr$_x$FeO$_3$ (LSFO) and La$_{1-x}$Sr$_x$MnO$_3$ (LSMO) thin films. In the case of SVO, from comparison of the experimental results with calculated surface electronic structure, we concluded that the obtained band dispersions reflect the bulk electronic structure. The experimental band structures of LSFO and LSMO were analyzed assuming the G-type antiferromagnetic state and the ferromagnetic state, respectively. We also demonstrated that the intrinsic uncertainty of the electron momentum perpendicular to the crystal surface is important for the interpretation of the ARPES results of three-dimensional materials.