Understanding the bulk electronic structure of Ca1-xSrxVO3

TL;DR

This study combines advanced experiments and calculations to clarify the bulk electronic structure of Ca1-xSrxVO3, revealing polarization effects and resolving previous ambiguities about its electronic properties.

Contribution

It introduces a novel approach to extract bulk spectra by accounting for surface effects and polarization dependence in photoemission measurements.

Findings

Polarization dependence affects photoemission intensity of surface states.

Bulk spectra can be accurately extracted considering electron escape depth.

Resolved longstanding puzzles about the electronic structure of Ca1-xSrxVO3.

Abstract

We investigate the electronic structure of Ca1-xSrxVO3 using careful state-of-the-art experiments and calculations. Photoemission spectra using synchrotron radiation reveal a hitherto unnoticed polarization dependence of the photoemission matrix elements for the surface component leading to a substantial suppression of its intensity. Bulk spectra extracted with the help of experimentally determined electron escape depth and estimated suppression of surface contributions resolve outstanding puzzles concerning the electronic structure in Ca1-xSrxVO3.