Tracing quasiparticle dynamics and hybridization dynamics in PuCoGa5

Li Huang; Haiyan Lu

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arXiv · 2411.12468

Tracing quasiparticle dynamics and hybridization dynamics in PuCoGa5

Li Huang·Haiyan Lu

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Abstract

PuCoGa5 has attracted significant attention due to its record-breaking superconducting transition temperature Tc=18.5 K among known f-electron superconductors. Here we systematically investigated the evolution of correlated electronic states in the plutonium-based unconventional superconductor PuCoGa5 upon temperature using the embedded dynamical mean-field theory merged with density functional theory. The mixed-valence nature of PuCoGa5 leads to intriguing quasiparticle dynamics and hybridization dynamics. Our findings reveal the presence of Dirac fermions and a temperature-driven localized-itinerant crossover of 5f states. As the temperature decreases, the low-energy quasiparticle resonances develop gradually, while the high-energy quasiparticle resonances exhibit quite different behaviors with an initial increase and subsequent decrease. Furthermore, we identified a characteristic temperature of approximately 290 K for the onset of hybridization gaps, which is much lower than the coherence temperature 580 K for 5f electrons. These results provide valuable insight on the the electronic structures, quasiparticle dynamics, and hybridization processes in 5f correlated electron systems.

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Li Huang, Haiyan Lu. 2024-11-19. Tracing quasiparticle dynamics and hybridization dynamics in PuCoGa5. https://arxiv.org/abs/2411.12468

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