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Recent theoretical predictions of "unprecedented proximity" of the electronicground state of iridium fluorides to the SU(2) symmetric $j_{\mathrm{eff}}=1/2$limit, relevant for superconductivity in iridates, motivated us to investigatetheir crystal and electronic structure. To this aim, we performedhigh-resolution x-ray powder diffraction, Ir L$_3$-edge resonant inelasticx-ray scattering, and quantum chemical calculations on Rb$_2$[IrF$_6$] andother iridium fluorides. Our results are consistent with the Mott insulatingscenario predicted by Birol and Haule [Phys. Rev. Lett. 114, 096403 (2015)],but we observe a sizable deviation of the $j_{\mathrm{eff}}=1/2$ state from theSU(2) symmetric limit. Interactions beyond the first coordination shell ofiridium are negligible, hence the iridium fluorides do not show any magneticordering down to at least 20 K. A larger spin-orbit coupling in iridiumfluorides compared to oxides is ascribed to a reduction of the degree ofcovalency, with consequences on the possibility to realize spin-orbit-inducedstrongly correlated physics in iridium fluorides.

Possibility to realize spin-orbit-induced correlated physics in iridium fluorides