Phaseseparation in overdoped Y1-0.8Ca0-0.2Ba2Cu3O6.96-6.98
J. Röhler, C. Friedrich, T. Granzow, E. Kaldis, G. Böttger
Abstract
The dimpling in the CuO2 planes of overdoped Y1-yCayBa2Cu3 O6.96-6.98 (y=0.02-0.2) has been measured by x-ray absorption-fine- structure spectroscopy (Y-K EXAFS). A step-like decrease around 12% Ca indicates a percolation threshold for distorted sites of 5 cells, and thus phase segregation. We conclude the charge carriers added by substitution of Y3+ by Ca2+ to be trapped at the Ca sites and their nn environment.
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