In this work, the electronic structure, the uniform magnetic susceptibility, and the static and dynamic local magnetic susceptibilities of $\delta$-Pu are investigated with the help of density functional theory (DFT) plus dynamical mean-field theory. Consistent with experimental observations and at variance with DFT, the ground state at low temperature is found to be nonmagnetic and characterized as a mixed-valence system, where the local magnetic moment from the partially filled $5f$ shell is effectively screened by the conduction electrons. Importantly, as the temperature rises a local magnetic moment emerges with antiparallel orbital and spin angular momenta, leading to a transition from a Pauli-like behavior to an apparent weak Curie-Weiss magnetism in the uniform magnetic susceptibility. The crossover regime corresponds to the emergence of a local moment as evidenced by the local susceptibilities. This finding reconciles previous discrepancies between experimental observation and theoretical simulations.

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• Electronic structure
• Kondo effect
• Magnetic susceptibility
• Magnetism
• Paramagnetism
• Transition temperature
• Actinides
• Heavy-fermion systems
• Strongly correlated systems
• DFT+DMFT
• Dynamical mean field theory
• Electron-correlation calculations