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We report the infrared specular reflectivity of Co x (SiO 2 ) 1−x (x∼0.85, 0.55, 0.38) films on SiO 2 glass spanning from a metal-like to insulating behavior. While films for x∼0.85 show carrier metallic shielding and hopping conductivity, for x∼0.65 and lower concentrations, the nanoparticles’ number and size promote a localization edge near the highest longitudinal...
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