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Resonant x-ray diffraction experiments were performed for the metalliciridium oxide IrO$_{2}$. We observed anisotropic tensor of susceptibility (ATS)scattering, the spectrum of which shows a sharp contrast between the $L_{3}$and $L_{2}$ edges. At the $L_{3}$ edge, resonance excitations were clearlyobserved from the core 2$p$ orbitals to both the 5$d$ $t_{2g}$ and $e_{g}$orbitals. In contrast, the resonance mode associated with 5$d$ $t_{2g}$orbitals was indiscernible at the $L_{2}$ edge. This contrasting behaviorindicates that Ir 5$d$ $t_{2g}$ orbitals are fairly close to the $J_{\rm eff}$= 1/2 state due to the strong spin--orbit coupling in 5$d$ transition metalions, as in the Mott insulator Sr$_{2}$IrO$_{4}$. Our results clearlydemonstrate that ATS scattering is a useful probe for investigating complexorbital states in a metallic state. Such states induce novel phenomena such asthe spin Hall effect.

Complex Orbital State Stabilized by Strong Spin-Orbit Coupling in a Metallic Iridium Oxide IrO$_{2}$