Rapids- Spin-orbit-induced mixed-spin ground state in RNiO3 perovskites probed by x-ray absorption spectroscopy: Insight into the metal-to-insulator transition

C. PIAMONTEZE; F. M. F. DE GROOT; H. C. N. TOLENTINO; A. Y. RAMOS; N. E. MASSA,; J. A. ALONSO; M. J. MARTÍNEZ-LOPE

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

American Institute of Physics

Lugar: Mellville; Año: 2005 vol. 71 p. 20406 - 20410

0163-1829

We report on a Ni L2,3 edge x-ray absorption spectroscopy study in RNiO3 perovskites. These compounds exhibit a metal-to-insulator sMId transition as temperature decreases. The L3 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state exhibit a metal-to-insulator sMId transition as temperature decreases. The L3 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state exhibit a metal-to-insulator sMId transition as temperature decreases. The L3 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state L2,3 edge x-ray absorption spectroscopy study in RNiO3 perovskites. These compounds exhibit a metal-to-insulator sMId transition as temperature decreases. The L3 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state sMId transition as temperature decreases. The L3 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 RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state d spin-orbit coupling to create a mixed-spin ground state. We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state that induces a spin transition from an essentially low-spin to a mixed-spin state RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state