Three-Dimensional Bulk Electronic Structures of Ca1.5Sr0.5RuO4 Studied by Soft X-ray Angle-Resolved Photoemission

TL;DR

This study uses soft X-ray ARPES to reveal the three-dimensional bulk electronic structure of Ca1.5Sr0.5RuO4, showing significant kz dispersion and differences from surface-sensitive measurements, indicating a more 3D character.

Contribution

First direct bulk-sensitive measurement of the 3D Fermi surface in Ca1.5Sr0.5RuO4 using soft X-ray ARPES, highlighting its three-dimensional electronic nature.

Findings

Bulk Fermi surface topology at kz~0 differs from surface-sensitive ARPES.

Stronger kz dispersion observed in gamma Fermi surface sheet.

Ca1.5Sr0.5RuO4 exhibits a more three-dimensional electronic structure.

Abstract

We report on experimental data of the three-dimensional bulk Fermi surfaces of the layered strongly correlated Ca1.5Sr0.5RuO4 system. The measurements have been performed by means of hn-depndent bulk-sensitive soft x-ray angle-resolved photoemission technique. Our experimental data evinces the bulk Fermi surface topology at kz~0 to be qualitatively different from the one observed by surface-sensitive low-energy ARPES. Furthermore, stronger kz dispersion of the circle-like gamma Fermi surface sheet is observed compared with Sr2RuO4. Thus in the paramagnetic metal phase, Ca1.5Sr0.5RuO4 compound is found to have rather three-dimensional electronic structure.