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The ratio of orbital (L) and spin (S) contributions to the magneticallyordered moments of a 5d transition metal oxide, Sr2IrO4 was evaluated bynon-resonant magnetic x-ray diffraction. We applied a new experimental settingto minimize the error in which we varied only the linear-polarization ofincident x-ray at a fixed scattering angle. Strong polarization dependence ofthe intensity of magnetic diffraction was observed, from which we conclude thatthe ordered moments contain substantial contribution from the orbital degree offreedom with the ratio of <L>/<S> ~5.0, evidencing the pronounce effect ofspin-orbit coupling. The obtained ratio is close to but slightly larger thanthe expected value for the ideal J_eff = 1/2 moment of a spin-orbital Mottinsulator, |<J_1/2|L_z|J_1/2>|/|<J_1/2|S_z|J_1/2>| = 4, which cannot beaccounted by the redistribution of orbital components within the t_2g bandsassociated with the elongation of the IrO6 octahedra.

Spin and Orbital Contributions to Magnetically Ordered Moments in 5d Layered Perovskite Sr2IrO4