EMPTY ELECTRON-STATES IN FE2O3 BY ULTRAVIOLET INVERSE-PHOTOEMISSION SPECTROSCOPY

被引:42
作者
CICCACCI, F
BRAICOVICH, L
PUPPIN, E
VESCOVO, E
机构
[1] Istituto di Fisica, Politecnico di Milano, I-20133 Milano
关键词
D O I
10.1103/PhysRevB.44.10444
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present a set of angle-integrated inverse-photoemission data on Fe2O3 taken in the ultraviolet region (12.1-24.2 eV) in the isochromat mode. The photon-energy dependence of the spectra gives direct insight into the orbital origin of the empty electron states in the oxide. The results are discussed in terms of the available theories based on a cluster model with configuration interaction, which reproduce quite well the direct-photoemission results. It is shown that these calculations are less satisfactory in fitting the electron-addition spectroscopy of empty states. We suggest that this might be due to an overestimation of U, the on-site d-d Coulomb correlation energy.
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页码:10444 / 10448
页数:5
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