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We have investigated the pressure-induced spin-state transition in Co$^{2+}$systems in terms of a competition between the Hund's exchange energy ($J$) andthe crystal-field splitting ($\Delta_{CF}$). First, we show the universalmetastability of the low-spin state in octahedrally coordinated Co$^{2+}$systems. Then we present the strategy to search for a Co$^{2+}$ system, forwhich the mechanism of spin-state and metal-insulator transitions is governednot by the Mott physics but by $J$ vs. $\Delta_{CF}$ physics. Using CoCl$_{2}$as a prototypical Co$^{2+}$ system, we have demonstrated the pressure-inducedspin-state transition from high-spin to low-spin, which is accompanied withinsulator-to-metal and antiferromagnetic to half-metallic ferromagnetictransitions. Combined with metastable character of Co$^{2+}$ and the highcompressibility nature of CoCl$_{2}$, the transition pressure as low as 27 GPacan be identified on the basis of $J$ vs. $\Delta_{CF}$ physics.

Universal metastability of the low-spin state in Co$^{2+}$ systems: non-Mott type pressure-induced spin-state transition in CoCl$_{2}$