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X-ray diffraction, electrical resistivity, magnetization, specific heat, andthermoelectric power measurements are presented for single crystals of the newfilled skutterudite compound {\CeOsAs}, which reveal phenomena that areassociated with f - electron - conduction electron hybridization. Valencefluctuations or Kondo behavior dominates the physics down to $T$ $\sim$ 135 K.The correlated electron behavior is manifested at low temperatures as ahybridization gap insulating state. The small energy gap $\Delta$$_1$/k$_B$$\sim$ 73 K, taken from fits to electrical resistivity data, correlates withthe evolution of a weakly magnetic or nonmagnetic ground state, which isevident in the magnetization data below a coherence temperature $T$$_{coh}$$\sim$ 45 K. Additionally, the low temperature electronic specific heatcoefficient is small, $\gamma$ $\sim$ 19 mJ/mol K$^2$. Some results for thenonmagnetic analogue compound {\LaOsAs} are also presented for comparisonpurposes.

The filled skutterudite CeOs$_{4}$As$_{12}$: a hybridization gap semiconductor