Magnetism, structure and transport of Y1−Ca CoO3 and La1−Ba CoO3

Abstract We compare the magnetic, structural and transport properties of La1−xBaxCoO3 and Y1−xCaxCoO3 perovskites. The experimental data supported by ab initio calculations reveal that: (i) Y-based perovskites are up to room temperature represented by essentially insulating LS state (T K ) followed by a gradual increase to IS state (S∼1) with enhanced conductivity above 500 K , (ii) the magnetic interactions in La-based perovskites are antiferromagnetic with S∼1.5 (T>700 K ) and (iii) the Ba doping induces the ferromagnetic correlations and leads to a highly conducting state above 600 K .