By Editors: K. A. Gschneidner, Jr., J.-C. G. Bunzli, and V. K.Pecharsky
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Extra resources for Handbook on the Physics and Chemistry of Rare Earths, Vol. 33
Example text
13. Yb filled skutterudites YbFe4 Sb12 was first synthesized by Dilley et al. (1998). Measurements of the lattice constant, magnetization, resistivity and heat capacity suggest an intermediate valence for the Yb ions. , 1999). The electronic specific heat coefficient is estimated to be γ = 140 mJ/mol K2 which indicates that the effective mass of the conduction electrons is moderately enhanced at low temperatures. The characteristic temperature, T ∗ , for the Yb valence fluctuations is estimated to be 50 K (see fig.
43 value expected from BCS theory. Values for ΘD and γ are 232 K and 59 mJ/mol K2 , respectively. The magnetic susceptibility data indicates a non-magnetic ground state for the Pr +3 ions and a substantial crystal field splitting greater than 125 K (Takeda and Ishikawa, 2000b). Fig. 16. D. , 2002). C. D. , 2002). 76 K and by the slope of the critical field near Tc . Both analyses suggest γ ≈ 350 mJ/mol K2 and m∗ ≈ 100 me . The resistivity, magnetic susceptibility and heat capacity data are shown in fig.
Electronic contribution to the heat capacity divided by temperature vs. log10 T for a series of La doped alloys of CeRu4 Sb12 . The data has been corrected for a phonon contribution, using heat capacity data from LaRu4 Sb12 , and a nuclear quadrupolar contribution from 121 Sb and 123 Sb (Takeda and Ishikawa, 2001). FILLED SKUTTERUDITES 17 resistivity is about 75 K. , 2001). Optical measurements are able to directly measure the pseudo-gap, Δ, created by the hybridization between the Ce 4f states and the extended conduction band states.