Structure and chemical valence study of Sr n+1Ru nO3 n+1 ( n = 1, 2, ∞) series
Zheng Long†, Zhu Xiao-Qin, Sui Yong-Xing, Xue Jian-Zhong, Liu Bo, Pei Ming-Xu
       
Schematic illustration of the unit cells of (a) Sr2RuO4 with space group I 4/ mmm , (b) Sr3Ru2O7 with space group I 4/ mmm , and (c) SrRuO3 with space group Pnma . (d) Schematic illustration of the rotation (upper) and tilting (down) effect between RuO6 octahedra. Ru ions are in the center of each octahedra.