Figure 8

(a) The evolution of κ_L from pure Co₄Sb₁₂ (without resonance), to Yb_xCo₄Sb₁₂ (with resonance) and to the calculated Yb_xCo₄Sb₁₂ containing 10 nm nano-inclusions. (b) Schematic plot for the resonant scattering and the potential well for different fillers in CoSb₃. Data are from ref. 131.