Competition between Kondo and RKKY exchange couplings in Pu{1-x}Am{x} alloys

Abstract

To clarify the role of the Kondo effect in screening local magnetic moments of Plutonium 5f--electrons as well as its competition to the RKKY interactions we use a combination of density functional theory with static Hartree Fock and dynamic Hubbard 1 approximations to calculate the strength of both the Kondo exchange, J_K, and of the RKKY exchange, J_RKKY, couplings for Pu{1-x}Am{x} system as a function of x. We find that J_K increases despite the atomic volume gets larger with the Am doping due to unexpected enhancement of hybridization between f and conduction electrons in the vicinity of the Fermi level. At the same time, the RKKY exchange is shown to reduce smoothly with increasing x. Our results imply that the Kondo effect should be robust against the increase in interatomic spacing of this alloy.

5 pages, 1 figure

References in corpus (5)

• Quantum Monte Carlo Impurity Solver for Cluster DMFT and Electronic Structure Calculations in Adjustable Base
• Screened Coulomb interaction in the maximally localized Wannier basis
• What is the valence of a correlated solid? The double life of delta-plutonium
• Calculations of Magnetic Exchange Interactions in Mott--Hubbard Systems
• Electronic structure and non-magnetic character of $\delta$-Pu-Am alloys

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