  The intricate interplay between itinerant-localized 5f states and strongly
correlated electronic states have been systematically investigated in
isostructural actinide compounds AnSn3 (An=U, Np, Pu) by using a combination of
the density functional theory and the embedded dynamical mean-field approach.
The obvious narrow flat 5f electronic band with remarkable spectral weight
emerges in the vicinity of Fermi level for three compounds. Subsequently the
significant hybridization between 5f states and conduction bands opens evident
gaps together with conspicuous valence state fluctuations jointly indicating
the partially itinerant 5f electrons. Especially, prominent quasiparticle
multiplets only appear in PuSn3 due to the sizable valence state fluctuations
and multiple competing atomic eigenstates. Therefore itinerant 5f states tend
to involve in active chemical bonding, restraining the formation of local
magnetic moment of actinide atoms, which partly elucidates the underlying
mechanism of paramagnetic USn3 and PuSn3, as well as itinerant-electron
antiferromagnetic NpSn3. Correspondingly, the 5f electronic correlation
strength expressed in band renormalization and electron effective masse
intertwines with itinerant-localized 5f states. Consequently, detail electronic
structure of 5f states dependence on actinide series shall gain deep insight
into our understanding of AnSn3 (An=U, Np, Pu) intermetallics and promote
ongoing research.
