OXYGEN-1S AND COBALT-2P X-RAY ABSORPTION OF COBALT OXIDES
OXYGEN-1S AND COBALT-2P X-RAY ABSORPTION OF COBALT OXIDES
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DOI：
10.1088/0953-8984/5/14/023
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发表时间：
1993-04-05
影响因子：
2.7
通讯作者：
SETTE, F
中科院分区：
文献类型：
--
作者：
DEGROOT, FMF;ABBATE, M;SETTE, F
测量了CoO、掺Li的CoO和LiCoO_2的氧的ls和钴的2 p x射线吸收谱，其分辨率为0.1eV。钴的2 p光谱分析与配位场多重态模型和电荷转移效应的列入进行了讨论。氧的ls谱被解释为空氧p态的跃迁，并得出结论，在3d带的相关性的影响可能是太小，无法检测。确定了氧化物中钴离子的对称性和电子构型。结果表明，与NiO和La_2CuO_4相比，掺杂诱导态可能具有1A_1对称性，这意味着准粒子的自旋为3/2，并且很可能被俘获.
The oxygen ls and cobalt 2p x-ray absorption spectra of CoO, Li-doped CoO and LiCoO2 have been measured with 0.1 eV resolution. The cobalt 2p spectra are analysed with a ligand-field multiplet model and the inclusion of charge-transfer effects is discussed. The oxygen ls spectra are interpreted as transitions to empty oxygen p states and it is concluded that the effects of correlations in the 3d band possibly are too small to be detectable. The symmetries and the electronic configurations of the cobalt ions in the oxides are determined. It is concluded that, in contrast to for example NiO and La2CuO4, the doping-induced states are possibly of 1A1 symmetry, which would imply that the quasi-particles have spin 3/2 and are most likely trapped.