Hund's physics extends to actinide f electron systems
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912609798717440 |
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| author | Kang, Byungkyun Herrera-Navarro, Roy N. Micklo, Stephen S. Pederson, Mark R. Kim, Eunja |
| author_facet | Kang, Byungkyun Herrera-Navarro, Roy N. Micklo, Stephen S. Pederson, Mark R. Kim, Eunja |
| contents | Uranium 5f electrons often yield heavy-fermion behavior via Kondo screening. However, the pronounced bad-metallic transport of uranium mononitride (UN) defies an incoherent Kondo explanation. Using density-functional theory combined with dynamical mean-field theory, we show that UN is a strongly correlated bad metal. The dominant correlations arise from intra-atomic Hund's exchange interaction between two 5f electrons, which aligns local magnetic moments and produces large quasiparticle mass renormalization. This identifies UN as a 5f-electron analogue of a Hund's metal-a paradigm chiefly associated with transition-metal d systems. Our results motivate a re-examination of the interplay between Mott, Kondo, and Hund-driven correlations across actinide correlated materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_23033 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hund's physics extends to actinide f electron systems Kang, Byungkyun Herrera-Navarro, Roy N. Micklo, Stephen S. Pederson, Mark R. Kim, Eunja Strongly Correlated Electrons Uranium 5f electrons often yield heavy-fermion behavior via Kondo screening. However, the pronounced bad-metallic transport of uranium mononitride (UN) defies an incoherent Kondo explanation. Using density-functional theory combined with dynamical mean-field theory, we show that UN is a strongly correlated bad metal. The dominant correlations arise from intra-atomic Hund's exchange interaction between two 5f electrons, which aligns local magnetic moments and produces large quasiparticle mass renormalization. This identifies UN as a 5f-electron analogue of a Hund's metal-a paradigm chiefly associated with transition-metal d systems. Our results motivate a re-examination of the interplay between Mott, Kondo, and Hund-driven correlations across actinide correlated materials. |
| title | Hund's physics extends to actinide f electron systems |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.23033 |