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Maximizing the ratio between Kitaev and residual Heisenberg interactions is amajor goal in nowadays research on Kitaev-Heisenberg quantum magnets. Here weinvestigate Kitaev-Heisenberg exchange in a recently discovered crystallinephase of RuCl$_3$ under presure -- it displays unusually high symmetry, withonly one type of Ru-Ru links, and uniform Ru-Cl-Ru bond angles of$\approx$93$^{\circ}$. By quantum chemical calculations in this particularhoneycomb-lattice setting we find a very small $J$, which yields a $K/J$ ratioas large as $\sim$100. Interestingly, we also find that this is associated withvanishingly small $d$-shell trigonal splittings, i.\,e., minimal departure fromideal $j_{\mathrm{eff}}\!=\!1/2$ moments. This reconfirms RuCl$_3$ as a mostpromising platform for materializing the much sought-after Kitaev spin-liquidphase and stimulates further experiments under strain and pressure.

Sweet spot in the RuCl$_3$ magnetic system: nearly ideal $j_{\mathrm{eff}}\!=\!1/2$ moments and maximized $K/J$ ratio under pressure