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– The atomic structure at surface of the layered perovskite Ca 1.9 Sr 0.1 RuO 4 has been studied by Low Energy Electron Diffraction (LEED) I-V. The perovskite Ca 1.9 Sr 0.1 RuO 4 of single crystal was cleaved in ultra high vacuum chamber (the pressure in the chamber was about 1x10 -10 Torr). The experiments were conducted at room temperature (T=300 K). The sharp LEED pattern was observed which indicates that the surface of Ca 1.9 Sr 0.1 RuO 4 is flat and it is a well ordered crystal. LEED I-V data, nine equivalent beams of the layered perovskite Ca 1.9 Sr 0.1 RuO 4 were recorded at room temperature. LEED I-V calculation was performed to fit experimental data to obtain the surface atomic structure. The LEED I-V analysis reveals that in the surface of the layered perovskite Ca 1.9 Sr 0.1 RuO 4 the RuO 6 octahedra are rotated (in-plane rotation) alternating clockwise and counterclockwise. The in-plane rotation at the surface is 11 degree which is smaller than that in the bulk (13 degree). The Ru – O(1) bond-length at the surface is found to be 1.936 A which is about the same as in the bulk (1.939 A). The Ru – O(2) bond length at the surface is 1.863 A which is much shorter than that in the bulk (2.040 A). The volume of octahedral Ru-O 6 at the surface is reduced by 9% with respect to the bulk. This finding shows that the atomic structure at surface of the layered perovskite Ca 1.9 Sr 0.1 RuO 4 is significantly different than that in the bulk. These lattice distortions strongly influence its electronic properties. Key words: Transition Metal Oxide; Perovskite; Surface Atomic Structure; LEED I-V

Surface Structural Analysis of the Layered Perovskite Ca1.9Sr0.1RuO4 by Low Energy Electron Diffraction I-V