Phaseseparation in overdoped Y{sub 1-0.8}Ca{sub 0-0.2}Ba{sub 2}Cu{sub 3}O{sub 6.96-6.98}

Phaseseparation in overdoped Y{sub 1-0.8}Ca{sub 0-0.2}Ba{sub 2}Cu{sub 3}O{sub 6.96-6.98}

The dimpling in the CuO{sub 2} planes of overdoped Y{sub 1-y}Ca{sub y}Ba{sub 2}Cu{sub 3}O{sub 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, a...

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Veröffentlicht in:AIP conference proceedings 1999-09, Vol.483 (1)
Hauptverfasser: Roehler, J., Friedrich, C., Granzow, T., Kaldis, E., Boettger, G.
Format: Artikel
Sprache:eng
Schlagworte:
ABSORPTION SPECTROSCOPY
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM IONS
CHARGE CARRIERS
COPPER OXIDES
CUPRATES
FINE STRUCTURE
HIGH-TC SUPERCONDUCTORS
MATERIALS SCIENCE
PHASE TRANSFORMATIONS
TRANSITION TEMPERATURE
TRAPPING
X-RAY SPECTROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM IONS
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Zusammenfassung:The dimpling in the CuO{sub 2} planes of overdoped Y{sub 1-y}Ca{sub y}Ba{sub 2}Cu{sub 3}O{sub 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{sup 3+} by Ca{sup 2+} to be trapped at the Ca sites and their nn environment.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.59633