A sample of RuSr2GdCu2O8, in which ferromagnetism and superconductivity coexist at low temperatures, has bran studied by variable temperature synchrotron X-ray powder diffraction. The structure is found to be tetragonal, P4/mmm between 295 and 10 K, As RuSr2GdCu2O8 is cooled the in-plane CuO bond length decreases whilst the in-plane Ru-O bond remains constant, which results in the increase of the bond mismatch between the two in-plane bonds. This increases the rotation of the RuO6 octahedra around (c) under bar slightly as the temperature decreases. Surprisingly the only evidence for a structural anomaly accompanying the ferromagnetic ordering of the Ru moments at 132 K is a change in the atomic displacement factor of the oxygen atoms within the CuO2 planes. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.
|Number of pages||5|
|Journal||International Journal of Inorganic Materials|
|Publication status||Published - Feb 2000|
- magnetic materials
- X-ray diffraction
- crystal structure
- RESOLUTION POWDER DIFFRACTION