Cruce localizado-itinerante 5f impulsado por la temperatura y fermiones de Dirac en PuCoGa5

PuCoGa5 has attracted significant attention due to its record-breaking superconducting transition temperature Tc (≈ 18.5 K) among known f electron superconductors. We present a comprehensive investigation of the temperature-driven evolution of the electronic structure in the heavy-fermion superconductor PuCoGa5 using dynamical mean-field theory (DMFT) combined with density functional theory (DFT). Our calculations reproduce key features of experimental photoemission spectroscopy and reveal a pronounced crossover of Pu-5f electrons from localized states at high temperatures to itinerant, coherent heavy quasiparticles at low temperatures. This crossover is unequivocally evidenced by the emergence of a sharp Kondo resonance peak near the Fermi level, a large Fermi surface expansion, and a coherence temperature of 580 K extracted from the electron self-energy functions. Furthermore, we identify a symmetry-protected, fourfold degenerate Dirac node, originating from the s-pz orbital crossing of Ga electrons. Notably, this Dirac fermion remains robust against strong correlations and shifts in energy with temperature, coexisting with the emergent coherent 5f states. Our work underscores PuCoGa5 as a unique platform where intertwined topology, strong correlations, and valence fluctuations lead to rich quantum phenomena.