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Journal Article

Two-dimensional wetting layer structures of reduced ternary oxides on Ru(0001) and Pt(111)


Widdra,  Wolf
Max Planck Institute of Microstructure Physics, Max Planck Society;

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Zollner, E. M., Schuster, F., Meinel, K., Stötzner, P., Schenk, S., Allner, B., et al. (2020). Two-dimensional wetting layer structures of reduced ternary oxides on Ru(0001) and Pt(111). Physica Status Solidi B, 257(7): 1900655. doi:10.1002/pssb.201900655.

Cite as: https://hdl.handle.net/21.11116/0000-0008-D9EF-7
Long-range ordered structures of reduced oxide films with monolayer thickness derived from BaTiO3 and SrTiO3 on Ru(0001) and Pt(111) are investigated by scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). Upon ultrahigh vacuum annealing at 1100 K, a hexagonal phase is observed for BaTiO3 on Ru(0001), which forms similarly from SrTiO3 on Pt(111). At higher temperatures, a triangle–square tiling called σ-phase develops in the BaTiO3/Ru(0001) system, with a unit cell rotation of 15° against the Ru(0001) substrate. Furthermore, it is shown that this 15° rotated σ-phase also forms in the BaTiO3/Pt(111) system in addition to the already known 8° rotated σ-phase. The results emphasize a strong flexibility in the structural parameters of the reduced oxide wetting layers in response to the substrate interaction strength.