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Sommerfeld coefficient of δ-Pu determined via a low-temperature specific heat Pu-Ce study
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SYSNO ASEP 0355441 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Sommerfeld coefficient of δ-Pu determined via a low-temperature specific heat Pu-Ce study Author(s) Havela, L. (CZ)
Javorský, P. (CZ)
Shick, Alexander (FZU-D) RID, ORCID
Kolorenč, Jindřich (FZU-D) RID, ORCID, SAI
Colineau, E. (DE)
Rebizant, J. (DE)
Wastin, F. (DE)
Griveau, J.C. (DE)
Jolly, L. (FR)
Texier, G. (FR)
Delaunay, F. (FR)
Baclet, N. (FR)Source Title Physical Review. B - ISSN 1098-0121
Roč. 82, č. 15 (2010), 155140/1-155140/5Number of pages 5 s. Language eng - English Country US - United States Keywords Sommerfeld coefficient γ ; δ-Pu Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GAP204/10/0330 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000283488600004 DOI 10.1103/PhysRevB.82.155140 Annotation Low-temperature specific-heat experiments on δ-Pu stabilized by Ce give the value of the Sommerfeld coefficient γ in the close vicinity of 40 mJ/mol K2. The most precise data set for Pu-6.1 at. % Ce yields γ=(41.5±0.5) mJ/mol K2 and the Debye temperature θD=(103.0±0.5 K). As Ce is in a compressed α-Ce state, major contribution to the γ value comes from the Pu states. Theoretical calculations suggest that the 5f6 admixture in the 5f5 ground state is responsible for the high-γ value. Although the 5f states are not present at the Fermi level, low-energy excitations due to transitions of the 5f6→5f5 type contribute to the spectral density around the Fermi level. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2011
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