Structural anomalies, spin transitions and charge disproportionation in LnCoO3

Details Structural anomalies, spin transitions and charge disproportionation in LnCoO3 Structural anomalies, spin transitions and charge disproportionation in LnCoO3

2007-10-15

arxiv.org/abs/0710.2759v1

Physics

Condensed Matter

Materials Science

52.Conference on Magnetism and Magnetic Materials, November 2007, Tampa

Scientific paper

10.1063/1.2828534

The diamagnetic-paramagnetic and insulator-metal transitions in LnCoO3 perovskites (Ln = La, Y, rare earths) are reinterpreted and modeled as a two-level excitation process. In distinction to previous models, the present approach 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 LS ground state. The second excitation is based on the interatomic electron transfer between the LS/HS pairs, leading finally to a stabilization of the metallic phase based on IS Co3+. The model parameters have been quantified for Ln = La, Pr and Nd samples using the powder neutron diffraction on the thermal expansion of Co-O bonds, that is associated with the two successive spin transitions. The same model is applied to interpret the magnetic susceptibility of LaCoO3 and YCoO3.

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