Photoemission and the Electronic Structure of PuCoGa5

TL;DR

This study combines photoelectron spectroscopy and novel theoretical methods to analyze the electronic structure of PuCoGa5, revealing insights into 5f electron behavior and its implications for understanding plutonium-based materials.

Contribution

It introduces a new theoretical scheme and provides detailed experimental data that clarify the dual localized and itinerant nature of 5f electrons in PuCoGa5.

Findings

Two regions of 5f spectral intensity observed

5f electrons are on the threshold between localized and itinerant

Broader understanding of Pu 5f electronic properties

Abstract

The electronic structure of the first Pu based superconductor PuCoGa5 is explored using photoelectron spectroscopy and a novel theoretical scheme. Exceptional agreement between calculation and experiment defines a path forward for understanding electronic structure aspects of Pu based materials. The photoemission results show two separate regions of 5f electron spectral intensity, one at the Fermi energy and another centered 1.2 eV below the Fermi level. The results for PuCoGa5 clearly indicate 5f electron behavior on the threshold between localized and itinerant. Comparisons to delta phase Pu metal show a broader framework for understanding the fundamental electronic properties of the Pu 5f levels in general within two configurations, one localized and one itinerant.