Role of oxide ionicity in electronic screening at oxide/metal interfaces

被引:49
作者
Chambers, SA [1 ]
Droubay, T [1 ]
机构
[1] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA
关键词
D O I
10.1103/PhysRevB.64.075410
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Metal and oxygen core-level Auger and photoemission spectra have been measured for ultrathin epitaxial films of alpha -Cr2O3 and alpha -Fe2O3 on Pt(111). The binding-energy shifts of monolayer films relative to thicker films suggest a much smaller extent of screening by the metal substrate than that reported earlier for MgO/ Ag(001) [S. Altieri, L. H. Tjeng, F. C. Voogt, T. Hibma, and G. A. Sawatsky, Phys. Rev. B 59, R2517 (1999)]. This finding suggests that the higher degree of bond covalency in alpha -Cr2O3 and alpha -Fe2O3 relative to MgO results in more effective intrinsic screening of charge-transfer processes, rendering the metal much less effective for extrinsic screening. As a result, the metal is expected to have a negligible effect on the optical, electronic, and magnetic properties of the oxide.
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页数:6
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