Low-temperature specific-heat experiments on d-Pu stabilized by Ce give the value of the Sommerfeld coefficient ¿ in the close vicinity of 40 mJ/mol K2. The most precise data set for Pu-6.1 at. % Ce yields ¿ =(41.5±0.5) mJ/mol K2 and the Debye temperature TD=(103.0±0.5 K). As Ce is in a compressed a-Ce state, major contribution to the ¿ value comes from the Pu states. Theoretical calculations suggest that the 5f6 admixture in the 5f5 ground state is responsible for the high-¿ 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.
HAVELA L.;
JAVORSKY P.;
SHICK A. B.;
KOLORENC J.;
COLINEAU Eric;
REBIZANT J.;
WASTIN Franck;
GRIVEAU Jean-Christophe;
JOLLY L.;
TEXIER Gwenael;
DELAUNAY F.;
BACLET N.;
2010-11-19
AMER PHYSICAL SOC
JRC61233
1098-0121,
https://publications.jrc.ec.europa.eu/repository/handle/JRC61233,
10.1103/PhysRevB.82.155140,
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