Microscopic investigation of enhanced Pauli paramagnetism in metallic Pu$_2$C$_3$
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arXiv
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| Format: | Preprint |
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2025
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| author | Yamamoto, R. Cook, M. S. Altenhof, A. R. Sherpa, P. Park, S. Thompson, J. D. Mason, H. E. Arellano, D. C. Prada, D. V. Tobash, P. H. Ronning, F. Bauer, E. D. Harrison, N. Phelan, W. A. Dioguardi, A. P. Hirata, M. |
| author_facet | Yamamoto, R. Cook, M. S. Altenhof, A. R. Sherpa, P. Park, S. Thompson, J. D. Mason, H. E. Arellano, D. C. Prada, D. V. Tobash, P. H. Ronning, F. Bauer, E. D. Harrison, N. Phelan, W. A. Dioguardi, A. P. Hirata, M. |
| contents | A combined study of the structural and electronic properties of polycrystalline Pu$_2$C$_3$ is reported based on x-ray diffraction, specific heat, magnetic susceptibility, ${}^{13}$C nuclear magnetic resonance (NMR), and band structure calculations. X-ray diffraction reveals a global noncentrosymmetric cubic lattice, with a nearest-neighbor C--C bond length of $r = 1.38$ Å. ${}^{13}$C NMR measurements indicate that the global cubic symmetry is locally broken, revealing two unique carbon environments. Magnetic susceptibility suggests enhanced Pauli paramagnetism, and specific heat reveals a moderately large electronic Sommerfeld coefficient $γ= 45$ mJ mol$_{\mathrm{Pu}}^{-1}$ K$^{-2}$, with a Wilson ratio $R_W \approx 1.3$ further indicating moderate correlations. ${}^{13}$C nuclear spin-lattice relaxation rate ($1/T_1$) and Knight shift ($K$) measurements find metallic Korringa behavior (i.e., $T_1TK^2=$ const.) with modest ferromagnetic spin fluctuations at low temperature. Taken together, the data point to a delocalized nature of a narrow 5$f$-electron band with weak electronic correlations. Density functional theory band-structure calculations confirm the appearance of such narrow 5$f$ bands near the Fermi level. Our data provide prime evidence for a plutonium-based metallic system with weak electronic correlations, which sheds new light on the understanding of complex paramagnetism in actinide-based metallic compounds. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_09911 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Microscopic investigation of enhanced Pauli paramagnetism in metallic Pu$_2$C$_3$ Yamamoto, R. Cook, M. S. Altenhof, A. R. Sherpa, P. Park, S. Thompson, J. D. Mason, H. E. Arellano, D. C. Prada, D. V. Tobash, P. H. Ronning, F. Bauer, E. D. Harrison, N. Phelan, W. A. Dioguardi, A. P. Hirata, M. Strongly Correlated Electrons A combined study of the structural and electronic properties of polycrystalline Pu$_2$C$_3$ is reported based on x-ray diffraction, specific heat, magnetic susceptibility, ${}^{13}$C nuclear magnetic resonance (NMR), and band structure calculations. X-ray diffraction reveals a global noncentrosymmetric cubic lattice, with a nearest-neighbor C--C bond length of $r = 1.38$ Å. ${}^{13}$C NMR measurements indicate that the global cubic symmetry is locally broken, revealing two unique carbon environments. Magnetic susceptibility suggests enhanced Pauli paramagnetism, and specific heat reveals a moderately large electronic Sommerfeld coefficient $γ= 45$ mJ mol$_{\mathrm{Pu}}^{-1}$ K$^{-2}$, with a Wilson ratio $R_W \approx 1.3$ further indicating moderate correlations. ${}^{13}$C nuclear spin-lattice relaxation rate ($1/T_1$) and Knight shift ($K$) measurements find metallic Korringa behavior (i.e., $T_1TK^2=$ const.) with modest ferromagnetic spin fluctuations at low temperature. Taken together, the data point to a delocalized nature of a narrow 5$f$-electron band with weak electronic correlations. Density functional theory band-structure calculations confirm the appearance of such narrow 5$f$ bands near the Fermi level. Our data provide prime evidence for a plutonium-based metallic system with weak electronic correlations, which sheds new light on the understanding of complex paramagnetism in actinide-based metallic compounds. |
| title | Microscopic investigation of enhanced Pauli paramagnetism in metallic Pu$_2$C$_3$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2506.09911 |