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

A. B. Shick; J. Kolorenc; J. Rusz; P. M. Oppeneer; A. I. Lichtenstein; M. I. Katsnelson; R. Caciuffo

doi:10.1103/PhysRevB.87.020505

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

A. B. Shick, J. Kolorenc, J. Rusz, P. M. Oppeneer, A. I. Lichtenstein, M. I. Katsnelson, R. Caciuffo

DOI 10.1103/PhysRevB.87.020505 · Physical Review B

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Abstract

Electronic structure calculations combining the local-density approximation with an exact diagonalization of the Anderson impurity model show an intermediate 5f5-5f6-valence ground state and delocalization of the 5f5 multiplet of the Pu atom 5f shell in PuCoIn5, PuCoGa5, and δ-Pu. The 5f local magnetic moment is compensated by a moment formed in the surrounding cloud of conduction electrons. For PuCoGa5 and δ-Pu the compensation is complete, and the Anderson impurity ground state is a singlet. For PuCoIn5 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-state antiferromagnetic fluctuations in PuCoIn5 and by valence fluctuations in PuCoGa5.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PuCoGa5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18.5	Pressure not reported	unknown
PuCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.5	Pressure not reported	unknown