High temperature singlet-based magnetism from Hund's rule correlations

Abstract

Uranium compounds can manifest a wide range of fascinating many-body phenomena, and are often thought to be poised at a crossover between localized and itinerant regimes for 5f electrons. The antiferromagnetic dipnictide USb2 has been of recent interest due to the discovery of rich proximate phase diagrams and unusual quantum coherence phenomena. Here, linear-dichroic X-ray absorption and elastic neutron scattering are used to characterize electronic symmetries on uranium in USb2 and isostructural UBi2. Of these two materials, only USb2 is found to enable strong Hund's rule alignment of local magnetic degrees of freedom, and to undergo distinctive changes in local atomic multiplet symmetry across the magnetic phase transition. Theoretical analysis reveals that these and other anomalous properties of the material may be understood by attributing it as the first known high temperature realization of a singlet ground state magnet, in which magnetism occurs through a process that resembles exciton condensation.

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• Spectroscopic determination of the atomic f-electron symmetry underlying hidden order in URu${}_2$Si${}_2$
• Direct bulk sensitive probe of 5f symmetry in URu2Si2
• The Tricritical Point of the f-electron Antiferromagnet USb2 Driven by High Magnetic Fields
• Measurement of the spectral line shapes for orbital excitations in the Mott insulator CoO using high-resolution resonant inelastic x-ray scattering
• Charge transfer excitations in VUV and soft X-ray resonant scattering spectroscopies
• Direct measurement of the localized-itinerant transition, hybridization and antiferromagnetic transition of 5f electrons

Cited by in corpus (8)

• Breakdown of the scaling relation of anomalous Hall effect in Kondo lattice ferromagnet USbTe
• Orbital-selective Kondo-lattice and enigmatic f-electrons emerging from inside the antiferromagnetic phase of a heavy fermion
• Signatures of Hundness in Kagome Metals
• Identifying f-electron symmetries of UTe2 with O-edge resonant inelastic X-ray scattering
• Singlet magnetism in intermetallic UGa${}_2$ unveiled by inelastic x-ray scattering
• Quantifying the U $5f$ covalence and degree of localization in U intermetallics
• Valence instability across magnetostructural transition in USb${}_2$
• Linear Foundation Model for Quantum Embedding: Data-Driven Compression of the Ghost Gutzwiller Variational Space