Quasiparticle multiplets and 5felectronic correlation in prototypical plutonium borides

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Chemistry

Background:

• Plutonium borides exhibit complex electronic properties due to 5f valence electrons.
• Understanding these properties is crucial for predicting material behavior and stability.

Purpose of the Study:

• Investigate the electronic structures of plutonium borides (PuB, x=1, 2, 6, 12).
• Uncover bonding behavior and orbital-dependent correlations of 5f valence electrons.
• Clarify the electronic structure and crystal stability of plutonium borides.

Main Methods:

• Density Functional Theory (DFT) combined with single-site dynamical mean-field theory (DMFT).
• Analysis of band structure, density of states, and hybridization functions.
• Examination of electron self-energy functions to determine electronic correlations.

Main Results:

• Reproduced the correlated topological insulator nature of PuB₆.
• Predicted metallicity in PuB (x=1, 2, 12).
• Indicated partially itinerant 5f states and mixed-valence behavior across all studied PuB compounds.
• Demonstrated moderate 5f correlations in PuB₆ and orbital-selective correlations in PuB (x=1, 2, 12).

Conclusions:

• Plutonium borides exhibit complex 5f electron correlations and mixed-valence behavior.
• Itinerant 5f electron behavior is tunable by hybridization strength, influenced by atomic distances.
• The findings provide insights into electronic structure, crystal stability, and potential new 5f electron states.