Phaseseparation in overdoped Y_{1-0.8}Ca_{0-0.2}Ba_2Cu_3O_{6.96-6.98}

Details Phaseseparation in overdoped Y_{1-0.8}Ca_{0-0.2}Ba_2Cu_3O_{6.96-6.98} Phaseseparation in overdoped Y_{1-0.8}Ca_{0-0.2}Ba_2Cu_3O_{6.96-6.98}

1999-02-02

arxiv.org/abs/cond-mat/9902030v1

in: "High Temperature Superconductivity", S.E. Barnes, J. Ashkenazi, J. L Cohn, F. Zuo (eds.), AIP Conference Proceedings 483

Physics

Condensed Matter

Superconductivity

5 pages, 2 eps figures, uses AIP 6x9 style

Scientific paper

10.1063/1.59633

The dimpling in the CuO_2 planes of overdoped Y_{1-y}Ca_yBa_2Cu_3 O_{6.96-6.98} (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 Y{3+} by Ca{2+} to be trapped at the Ca sites and their nn environment.

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