Abstract
A series of Y 0.999Gd 0.001Ba 2Cu 3O 6+ x compounds is studied by Gd 3+ EPR in the full range of oxygen content. The fine structu re is modified by the hole distribution in the Cu(2)O 2 layers mirroring oxygen chains in the Cu(1)O x layers. The fine structure of 5 differently occupied first-neighbour Cu(1)O x oxygen chain configurations surrounding the Gd 3+ ions is resolved. Formation of chain begins at a threshold oxygen content x 0=0.14. For x>0.14 oxygen in Cu(1)O x 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.
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