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Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 87: Metal Substrates: Structure, Epitaxy and Growth

O 87.5: Talk

Thursday, March 10, 2016, 16:15–16:30, S053

The surface reconstruction of Pt(001) revisitedRene Hammer1, Oliver Krahn1, Klaus Meinel1, and •Wolf Widdra1,21Martin-Luther-Universität Halle-Wittenberg, Halle, Germany — 2Max-Planck Institut für Mikrostrukturphysik, Halle, Germany

The complex hexagonal reconstruction of the (001) surfaces of platinum and gold is under debate since decades [1,2]. In the present study, we combine SPA-LEED and STM together with LEED simulations based on a Moiré approach to address the Pt(001) reconstruction. Smooth samples annealed at 900C show two domains of a c(26x128±10) superstructure. The superstructure evolves from a Moiré-like buckling of a quasi-hexagonal top layer (hex). The lattice vectors of the hex are reduced to 0.9606a and 0.9629a with respect to the interatomic distance a of Pt(001). The former runs exactly along [011] or [011] whereas the latter one deviates by 120.08 from that directions. Sample annealing at 1000 C stimulates a continuous rotation of the hex where all angles between 0 and ± 0.8 are simultaneously realized. At 1100C, the hex resides in fixed rotation angles of ±(0.77 ± 0.01). Sputtering at elevated temperatures lowers the value n of the c(26x2n) superstructure down to 34 and leads to a continuous rotation in the range of ±0.8. In many aspects, the Pt(001) reconstruction displays a similar behavior as found for Au(001) [2].

[1] P. Havu et al., Phys. Rev. B 82 (2010) 161418(R) and references therein;

[2] R. Hammer et al. Phys. Rev. B 90 (2014) 035446.

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