We report on a Ni L-2,L-3 edge x-ray absorption spectroscopy study in RNiO3 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 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据