Figure 6
(a) Co-Oapex bond length (red circles) and Co-Oin-plane bond length (blue squares) as well as the ratio Co-Oapex/Co-Oin-plane (black line) as a function of the external pressure derived from ref. 28. Note that the reduction of the in-plane Co-O bond distance might be overestimated due to the possible rotation of the CoO6 octahedron. (b) The energy diagram of three spin states as a function of the pressure using Co-O bond lengths in (a).
