A series of Y0.999Gd0.001Ba2Cu3O6+x compounds is studied by Gd3+ EPR in the full range of oxygen content. The fine structu re is modified by the hole distribution in the Cu(2)O2 layers mirroring oxygen chains in the Cu(1)Ox layers. The fine structure of 5 differently occupied first-neighbour Cu(1)Ox oxygen chain configurations surrounding the Gd3+ ions is resolved. Formation of chain begins at a threshold oxygen content x0=0.14. For x>0.14 oxygen in Cu(1)Ox planes is ordered mainly into chains, the amount of disordered oxygen decreases with increasing x. The EPR intensities are in quantitative agreement with a model calculation of 2-dimensionally ordered oxygen chains.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering