Sommerfeld Coefficient of d-Pu Determined Via a Low-Temperature Specific Heat Pu-Ce Study

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,