On the origin of the C induced $p4g$ reconstruction of Ni(001)

Details On the origin of the C induced $p4g$ reconstruction of Ni(001) On the origin of the C induced $p4g$ reconstruction of Ni(001)

2005-07-14

arxiv.org/abs/cond-mat/0507344v1

Physics

Condensed Matter

Materials Science

11 pages, 7 fugures

Scientific paper

First principles calculations of the geometric and electronic structures have been performed for two coverages (0.25 ML and 0.5 ML) of C on Ni(001) to understand the mechanism of the Ni(001) reconstruction induced by carbon adsorption. The calculated structural behavior of the system is in a good agreement with experimental observations. The calculated path and energetics of the $c(2\times 2)$ -- $p4g$ reconstruction in C$_{0.5}$/Ni(001) is provided. A dramatic reduction of the local electronic charge on adsorbed carbon is found to occur upon the reconstruction that decreases the electron-electron repulsion on C site. This effect together with the formation of covalent bonds between C and the second layer Ni atoms, leads to reconstruction of Ni(001).

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