Title: Electronic properties of Pu19Os simulating β-Pu: the strongly correlated Pu phase
Citation: JOURNAL OF PHYSICS-CONDENSED MATTER vol. 30 no. 8 p. 085601
Publication Year: 2018
JRC N°: JRC114419
ISSN: 0953-8984 (online)
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC114419
DOI: 10.1088/1361-648X/aaa520
Type: Articles in periodicals and books
Abstract: We established the basic electronic properties of ζ-Pu19Os, which is a close analogue to β-Pu, and its low-temperature variety, η-Pu19Os. Their magnetic susceptibility is 15% higher than for δ-Pu. A specific heat study of ζ-Pu19Os shows a soft lattice similar to δ-Pu, leading to a low Debye temperature ΘD = 101 K. The linear electronic coefficient γ related to the quasiparticle density of states at the Fermi level points to a higher value, 55 ± 2 mJ (mol Pu K2)–1, compared to 40 mJ (mol K2)–1 for δ-Pu. The results confirm that β-Pu is probably the most strongly correlated Pu phase, as had been indicated by resistivity measurements. The volume and related Pu–Pu spacing is clearly not the primary tuning parameter for Pu metal, as the β-Pu density stands close to the ground-state α-phase and is much higher than that for δ-Pu. The η-Pu19Os phase has a record γ-value of 74 ± 2 mJ (mol Pu K2)–1. The enhancement is not reproduced by LDA+DMFT calculations in the fcc structure, which suggests that multiple diverse sites can be the key to the understanding of β-Pu.
JRC Directorate:Nuclear Safety and Security

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