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The synthesis and characterization of the previously unknown materialLaCaScIrO$_6$ is reported. LaCaScIrO$_6$ presents a new example of the rarecase of a double perovskite with the strongly spin-orbit coupled5\textit{d}-ion Ir$^{4+}$ as its only magnetic species, forming amonoclinically distorted version of the frustrated fcc lattice. Magnetizationmeasurements show a weak anomaly at 8~K. The Curie-Weiss temperature\Theta$_{CW}$ and effective magnetic moment \mu$_{eff}$ of LaCaScIrO$_6$ are inclose proximity to the related compound La$_2$MgIrO$_6$ but differ fromLa$_2$ZnIrO$_6$. This suggests that the nature of the non-magnetic\textit{B}-ion, namely its \textit{d}-orbital filling has a strong influence onthe magnetic properties. The \textit{d}$^{0}$-ions Sc$^{3+}$ and Mg$^{2+}$allow a different kind of exchange interactions within the Ir-sublattice thanthe \textit{d}$^{10}$-ion Zn$^{2+}$. In addition, ac-susceptibility data doesnot show signs of a spin-glass ground state. The nature of the magnetism inLaCaScIrO$_6$ has been further elucidated using muon spin relaxationmeasurements. The zero-field measurements reveal the absence of well definedoscillations down to 1.6\,K, while temperature dependent $\mu$SR studies showan anomaly at 8\,K. Overall, our results suggest the presence of two differentmagnetic environments or domains in LaCaScIrO$_6$, which is likely related toits structural features.

Disordered magnetism in the double perovskite LaCaScIrO6 with a distorted fcc lattice of Ir4+