Unified character of correlation effects in unconventional Pu-based superconductors and δ-Pu

Abstract

Electronic structure calculations combining the local-density approximation with an exact diagonalization of the Anderson impurity model show an intermediate 5f^5-5f^6-valence ground state and delocalization of the 5f^5 multiplet of the Pu atom 5f-shell in PuCoIn_5, PuCoGa_5, and δ-Pu. The 5f-local magnetic moment is compensated by a moment formed in the surrounding cloud of conduction electrons. For PuCoGa_5 and δ-Pu the compensation is complete and the Anderson impurity ground state is a singlet. For PuCoIn_5 the compensation is partial and the Pu ground state is magnetic. We suggest that the unconventional d-wave superconductivity is likely mediated by the 5f-states antiferromagnetic fluctuations in PuCoIn_5, and by valence fluctuations in PuCoGa_5.

5 pages, 3 figures

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• Theory of nodal s+- wave pairing symmetry in the Pu-based 115 superconductor family
• Correlation strength and orbital differentiation across the phase diagram of plutonium metal
• Site and orbital selective correlations in $\beta$-Pu
• Renormalized dispersing multiplets in the spectrum of nearly Mott localized systems
• Probing magnetism in the vortex phase of PuCoGa${}_5$ by X-ray magnetic circular dichroism
• Thermal Expansion of the Heavy-fermion Superconductor PuCoGa${}_5$
• Microscopic Properties of the Heavy-Fermion Superconductor PuCoIn${}_5$ Explored by Nuclear Quadrupole Resonance
• Collapse of quasiparticle multiplets and $5f$ itinerant-localized crossovers in cubic phase Pu${}_3$Ga
• Electronic Structure of UGe${}_{2\pm x}$ Thin Films from Photoelectron Spectroscopy