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Pré-Publication, Document De Travail Année : 2006

Metal-ligand interplay in strongly-correlated oxides: a parametrized phase diagram for pressure induced spin transitions

Résumé

We investigate the magnetic properties of archetypal transition-metal oxides MnO, FeO, CoO and NiO under very high pressure by x-ray emission spectroscopy at the K\beta line. We observe a strong modification of the magnetism in the megabar range in all the samples except NiO. The results are analyzed within a multiplet approach including charge-transfer effects. The pressure dependence of the emission line is well accounted for by changes of the ligand field acting on the d electrons and allows us to extract parameters like local d-hybridization strength, O-2p bandwidth and ionic crystal field across the magnetic transition. This approach allows a first-hand insight into the mechanism of the pressure induced spin transition.

Dates et versions

hal-00130896 , version 1 (14-02-2007)

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A. Mattila, J. -P. Rueff, J. Badro, G. Vanko, A. Shukla. Metal-ligand interplay in strongly-correlated oxides: a parametrized phase diagram for pressure induced spin transitions. 2006. ⟨hal-00130896⟩
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