Thickness dependent structural and electronic properties of CuO adsorbed on SrTiO3(100): a hybrid density functional theory study

Details Thickness dependent structural and electronic properties of CuO adsorbed on SrTiO3(100): a hybrid density functional theory study Thickness dependent structural and electronic properties of CuO adsorbed on SrTiO3(100): a hybrid density functional theory study

2010-07-08

arxiv.org/abs/1007.1403v1

Physics

Condensed Matter

Materials Science

Scientific paper

We discuss the structural and electronic properties of tetragonal CuO grown on SrTiO3(100) by means of hybrid density functional theory. Our analysis explains the anomalously large Cu-O vertical distance observed in the experiments (~2.7 A) in terms of a peculiar frustration between two competing local Cu-O environments characterized by different in-plane and out-of-plane bond lengths and Cu electronic populations. The proper inclusion of substrate effects is crucial to understand the tetragonal expansion and to reproduce correctly the measured valence band spectrum for a CuO thickness of 3-3.5 unit cells, in agreement with the experimentally estimated thickness.

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