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The diamagnetic-paramagnetic and insulator-metal transitions in LnCoO3perovskites (Ln = La, Y, rare earths) are reinterpreted and modeled as atwo-level excitation process. In distinction to previous models, the presentapproach can be characterized as a LS-HS-IS (low-high-intermediate spin)scenario. The first level is the local excitation of HS Co3+ species in the LSground state. The second excitation is based on the interatomic electrontransfer between the LS/HS pairs, leading finally to a stabilization of themetallic phase based on IS Co3+. The model parameters have been quantified forLn = La, Pr and Nd samples using the powder neutron diffraction on the thermalexpansion of Co-O bonds, that is associated with the two successive spintransitions. The same model is applied to interpret the magnetic susceptibilityof LaCoO3 and YCoO3.

Structural anomalies, spin transitions and charge disproportionation in LnCoO3