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We report on high-field electron spin resonance studies of two iridiumhexahalide compounds, (NH$_4$)$_2$IrCl$_6$ and K$_2$IrCl$_6$. In theparamagnetic state, our measurements reveal isotropic $g$-factors $g = 1.79$(1)for the Ir$^{4+}$ ions, in agreement with their cubic symmetries. Mostimportantly, in the magnetically ordered state, we observe two magnon modeswith zero-field gaps of 11.3 and 14.2 K for (NH$_4$)$_2$IrCl$_6$ andK$_2$IrCl$_6$, respectively. Based on that and using linear spin-wave theory,we estimate the nearest-neighbor exchange couplings and anisotropic Kitaevinteractions, $J_1/k_B=10.3$ K, $K/k_B=0.7$ K for (NH$_4$)$_2$IrCl$_6$, and$J_1/k_B=13.8$ K, $K/k_B=0.9$ K for K$_2$IrCl$_6$, revealing thenearest-neighbor Heisenberg coupling as the leading interaction term, with onlya weak Kitaev anisotropy.

Antiferromagnetic resonance in the cubic iridium hexahalides (NH$_4$)$_2$IrCl$_6$ and K$_2$IrCl$_6$