Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-12-10
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, accepted as PRB - Rapid Comm. Dez. 2004
Scientific paper
10.1103/PhysRevB.71.020406
We report on a Ni L$_{2,3}$ edges x-ray absorption spectroscopy (XAS) study in $R$NiO$_3$ perovskites. These compounds exhibit a metal to insulator ($MI$) transition as temperature decreases. The L$_{3}$ edge presents a clear splitting in the insulating state, associated to a less hybridized ground state. Using charge transfer multiplet calculations, we establish the importance of the crystal field and 3d spin-orbit coupling to create a mixed-spin ground state. We explain the $MI$ transition in $R$NiO$_3$ perovskites in terms of modifications in the Ni$^{3+}$ crystal field splitting that induces a spin transition from an essentially low-spin (LS) to a mixed-spin state.
Alonso Jose Antonio
de Groot Frank M. F.
Martínez-Lope María Jesús
Massa Nestor E.
Piamonteze Cinthia
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