Fig. 2: Effect of 3d orbital filling on the electronic structure.

Schematic energy level diagram, orbital filling of the d-levels in the octahedron crystal field at the Co/Ni-3d and Re-5d sites and band structure with SOC for a tetragonal double perovskites, Sr₂CoReO₆, and b cubic double perovskites, Ba₂NiReO₆.