Many body quantum physics in XANES of highly correlated materials, mixed valence oxides and high temperature superconductors

TL;DR

This paper reviews how XANES spectroscopy, utilizing many-body quantum effects, reveals electronic correlations in complex materials like heavy fermions, mixed valence oxides, and high-temperature superconductors.

Contribution

It discusses the application of XANES many-body final states to probe electronic correlations in various complex systems, highlighting recent developments and insights.

Findings

Multi-electron excitations observed in XANES spectra.

XANES reveals electronic correlations in heavy fermions and oxides.

Insights into high-temperature superconductivity mechanisms.

Abstract

The x-ray absorption near edge structure (XANES), developed in these last 40 years using synchrotron radiation, is a unique tool probing electronic correlations in complex systems via quantum many body final state effects. Multi electron excitations have been observed first in the sixties in x-ray absorption spectra of atoms and later in molecules and solids. The applications of XANES many body final states to probe unique features of electronic correlation in heavy fermions, mixed valence systems, mixed valence oxides and high temperature superconductors are discussed.