Universal metastability of the low-spin state in Co${}^{2+}$ systems: non-Mott type pressure-induced spin-state transition in CoCl${}_2$

Bongjae Kim, Kyoo Kim, B. I. Min

We have investigated the pressure-induced spin-state transition in Co${}^{2+}$ systems in terms of a competition between the Hund's exchange energy ($J$) and the crystal-field splitt…