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We report on our investigation on the magnetism of the iridate doubleperovskite Sr$_2$CoIrO$_6$, a nominally Ir$^{5+}$ Van Vleck $J_{eff}=0$ system.Using x-ray absorption (XAS) and x-ray magnetic circular dichroism (XMCD)spectroscopy at the Ir-$L_{2,3}$ edges, we found a nearly zero orbitalcontribution to the magnetic moment and thus an apparent breakdown of the$J_{eff}=0$ ground state. By carrying out also XAS and XMCD experiments at theCo-$L_{2,3}$ edges and by performing detailed full atomic multipletcalculations to simulate all spectra, we discovered that the compound consistsof about 90% Ir$^{5+}$ ($J_{eff}=0$) and Co$^{3+}$ ($S=2$) and 10% Ir$^{6+}$($S=3/2$) and Co$^{2+}$ ($S=3/2$). The magnetic signal of this minorityIr$^{6+}$ component is almost equally strong as that of the main Ir$^{5+}$component. We infer that there is a competition between the Ir$^{5+}$-Co$^{3+}$and the Ir$^{6+}$-Co$^{2+}$ configurations in this stoichiometric compound.

Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6