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In heavy-fermion compounds, the dual character of $f$ electrons underliestheir rich and often exotic properties like fragile heavy quasipartilces,variety of magnetic orders and unconventional superconductivity. 5$f$-electronactinide materials provide a rich setting to elucidate the larger andoutstanding issue of the competition between magnetic order and Kondoentanglement and, more generally, the interplay among different channels ofinteractions in correlated electron systems. Here, by using angle-resolvedphotoemission spectroscopy, we present detailed electronic structure of USb$_2$and observed two different kinds of nearly flat bands in the antiferromagneticstate of USb$_2$. Polarization-dependent measurements show that theseelectronic states are derived from 5$f$ orbitals with different characters; inaddition, further temperature-dependent measurements reveal that one of them isdriven by the Kondo correlations between the 5$f$ electrons and conductionelectrons, while the other reflects the dominant role of the magnetic order.Our results on the low-energy electronic excitations of USb$_2$ implicateorbital selectivity as an important new ingredient for the competition betweenKondo correlations and magnetic order and, by extension, in the rich landscapeof quantum phases for strongly correlated $f$ electron systems.

Orbital-selective Kondo entanglement and antiferromagnetic order in USb$_2$