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

Abstract

In heavy-fermion compounds, the dual character of $f$ electrons underlies their rich and often exotic properties like fragile heavy quasipartilces, variety of magnetic orders and unconventional superconductivity. 5$f$-electron actinide materials provide a rich setting to elucidate the larger and outstanding issue of the competition between magnetic order and Kondo entanglement and, more generally, the interplay among different channels of interactions in correlated electron systems. Here, by using angle-resolved photoemission spectroscopy, we present detailed electronic structure of USb${}_2$ and observed two different kinds of nearly flat bands in the antiferromagnetic state of USb${}_2$. Polarization-dependent measurements show that these electronic states are derived from 5$f$ orbitals with different characters; in addition, further temperature-dependent measurements reveal that one of them is driven by the Kondo correlations between the 5$f$ electrons and conduction electrons, while the other reflects the dominant role of the magnetic order. Our results on the low-energy electronic excitations of USb${}_2$ implicate orbital selectivity as an important new ingredient for the competition between Kondo correlations and magnetic order and, by extension, in the rich landscape of quantum phases for strongly correlated $f$ electron systems.

arXiv comment5 pages, 4 figures; submitted for publication on May 27, 2019

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• Evolution of flat bands in MoSe${}_2$/WSe${}_2$ moiré lattices: A study combining machine learning and band unfolding methods
• Quasiparticle characteristics of the weakly ferromagnetic Hund's metal MnSi
• UOTe: Kondo-interacting topological antiferromagnet in a van der Waals lattice
• Fermi-surface reconstruction at the metamagnetic high-field transition in uranium mononitride
• Cross-over behavior of the localized to itinerant transition of 5f electrons in the antiferromagnetic Kondo lattice USb2
• Coexisting Kondo hybridization and itinerant f-electron ferromagnetism in UGe2
• Anisotropic Kondo pseudo-gap in URu2Si2
• Relocalization of Uranium 5f Electrons in Antiferromagnetic Heavy Fermion Superconductor UPd${}_2$Al${}_3$: Insights from Angle-Resolved Photoemission Spectroscopy
• Ultrafast Stiffening of the Lattice Potential and Metastable State Formation in 1$T$-TiSe${}_2$
• Interplay between local moment and itinerant magnetism in the layered metallic antiferromagnet TaFe${}_{1.14}$Te${}_3$
• Magnon Damping as a Probe of Kondo Coupling in Magnetically Ordered Systems
• Unconventional superconductivity emerging along with the strange-metal behavior in UAs2 under pressure
• Mott-Derived Local Moments and Kondo Hybridization in a d-electron Kagome lattice