Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-05-03
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 4 figures, Phys. Rev. B in press
Scientific paper
10.1103/PhysRevB.65.214107
Temperature dependent extended x-ray absorption fine structure (EXAFS) spectra were measured for a 3.3 at% Ga stabilized Pu alloy over the range T= 20 - 300 K at both the Ga K-edge and the Pu L_III-edge. The temperature dependence of the pair-distance distribution widths, \sigma(T) was accurately modeled using a correlated-Debye model for the lattice vibrational properties, suggesting Debye-like behavior in this material. We obtain pair- specific correlated-Debye temperatures, \Theta_cD, of 110.7 +/- 1.7 K and 202.6 +/- 3.7 K, for the Pu-Pu and Ga-Pu pairs, respectively. These results represent the first unambiguous determination of Ga-specific vibrational properties in PuGa alloys, and indicate the Ga-Pu bonds are significantly stronger than the Pu-Pu bonds. This effect has important implications for lattice stabilization mechanisms in these alloys.
Allen P. G.
Booth Corwin H.
Gallegos G. F.
Henderson Alexandra L.
Shen Heng Tao
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