Structure of the cobalt-filled missing-row reconstruction of Pt(110)

The atomic structure of 0.5 monolayer (ML) Co deposited on Pt(110) was investigated by quantitative low-energy electron diffraction and ab initio density functional theory calculations, showing a pronounced inward relaxation and a filling of the missing-row sites of the Pt(110) substrate by Co atoms. Up to this Co coverage no significant intermixing of Pt atoms with Co atoms was observed by scanning tunneling microscopy, resulting in an alternating arrangement of pure Co and Pt rows.

Figure 1

STM image taken after the deposition of 0.5 ML Co on the $p(1\times 2)$-reconstructed Pt(110) surface ($200\times 105{\mathrm{\AA }}^2,-0.5\mathrm{mV}$, 4.24 nA). The image has been contrast enhanced in order to facilitate the distinction between cobalt and platinum atoms.

Figure 2

Side view of the structural model considered by LEED (not to scale).

Figure 3

Comparison between experimental (black) and calculated (gray) LEED $I\text{−}V$ spectra of the best-fit model of the cobalt-filled missing-row structure of Pt(110). The Pendry $R$ factor is 0.24.