Angle-resolved photoemission spectroscopy study of PrFeAsO_{0.7}: Dependence of the electronic structure on the pnictogen height

TL;DR

This ARPES study investigates how the electronic structure of PrFeAsO_{0.7} varies with pnictogen height, revealing the influence of structural differences on band energies and Fermi surfaces in iron-based superconductors.

Contribution

It demonstrates the dependence of electronic band positions on pnictogen height, supported by ARPES data and LDA calculations, highlighting structural effects on electronic properties.

Findings

ARPES spectra align with LDA calculations after bandwidth reduction and chemical potential shift.

Differences in band energies between PrFeAsO_{0.7} and LaFePO are linked to pnictogen height.

Electronic structure shows sensitivity to structural parameters like pnictogen height.

Abstract

We have performed an angle-resolved photoemission spectroscopy (ARPES) study of the iron-based superconductor PrFeAsO_{0.7} and examined the Fermi surfaces and band dispersions near the Fermi level. Heavily hole-doped electronic states have been observed due to the polar nature of the cleaved surfaces. Nevertheless, we have found that the ARPES spectra basically agree with band dispersions calculated in the local density approximation (LDA) if the bandwidth is reduced by a factor of ~2.5 and then the chemical potential is lowered by ~70 meV. Comparison with previous ARPES results on LaFePO reveals that the energy positions of the d_{3z^2-r^2}- and d_{yz,zx}-derived bands are considerably different between the two materials, which we attribute to the different pnictogen height as predicted by the LDA calculation.