STRUCTURAL-ANALYSIS OF SR2RUO4

The structure of Sr2RuO4 has been studied by means of neutron single-c rystal diffraction as function of temperature. The analysis of the ani sotropic atomic displacement parameters (ADP) and the non-existence of superstructure reflections allow one to exclude structural deformatio ns similar to those occurring in Sr2IrO4 and La2CuO4, for short and lo ng range order type. Furthermore, we find no indication for an anomaly in the temperature dependence of the RuO6 octahedron elongation near 140 K where extrema in the resistivity have been reported.