Cu-O network dependent core hole screening in low-dimensional cuprate systems: a high-resolution x-ray photoemission study

TL;DR

This study uses high-resolution x-ray photoemission to explore how the screening of a Cu 2p core hole varies with dimensionality and Cu-O network geometry in undoped cuprates, revealing complexities beyond current models.

Contribution

It provides experimental insights into core hole screening in low-dimensional cuprates, highlighting the influence of network geometry beyond existing theoretical models.

Findings

Screening response varies with dimensionality and network geometry.

Experimental results challenge current three-band d-p model predictions.

Highlights the need for improved theoretical descriptions.

Abstract

We present an experimental study of the dynamics of holes in the valence bands of 0, 1, and 2 dimensional undoped model cuprates, as expressed via the screening of a Cu 2p core hole. The response depends strongly upon the dimensionality and the details of the Cu-O-Cu network geometry and clearly goes beyond the present theoretical state-of-the-art description within the three-band d-p model.