Resonant photoemission of transition metal perovskites

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Conference Proceeding

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We discuss the use of resonant photoemission in the study of rare earth/transition metal perovskites and perovskite-related structures. We illustrate its application to the assignment of the RE and TM valence band density of states in Nd2Ni1-xCuxO4 and REBaCo2O5+δ. In both cases, the relative positions of the 4f and 3d contributions within the valence band density of states (DOS) relative to the Fermi energy provide a rationalisation of the redox behaviour of the system. We also apply the technique to the determination of the Co spin state in Co(III) perovskites such as LaCoO3 and GdBaCo2O5+δ, where the observation of a delayed Co 3p → 3d resonance is a powerful diagnostic of the Co(III) low spin state. This reveals that while the Co(III) ions in LaCoO3 increasingly populate the low spin state as the sample temperature is lowered, a significant proportion of the Co(III) species in GdBaCo2O5+δ are not in the low spin state at temperatures as low as 50 K. © 2005 Elsevier B.V. All rights reserved.

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Journal of Electron Spectroscopy and Related Phenomena

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