ISSN:
1572-9605
Keywords:
Y(Ba2 − y Sr y )Cu3O6 + δ
;
high-T c superconductor
;
X-ray-absorption near-edge-structure spectra
;
hole concentration
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract The chemical control of underdoped and overdoped states in the Y(Ba2 − y Sr y )Cu3O6 + δ (δ∼0.1 and 0.9) compounds has been observed by high-resolution O K-edge X-ray-absorption near-edge-structure spectra. The chemical substitution of Sr for Ba in the fully-oxygenated Y(Ba2−y Sr y )Cu3O6 + δ (δ∼0.9) compounds gives rise to high hole concentrations within both the CuO2 planes and the out-of-plane sites, leading to the overdoped state and the decrease in the superconducting transition temperature from 92 K for y=0 to 84 K for y=0.8. In contrast, an increase in the Sr content in the oxygen-deficient Y(Ba2 − y Sr y )Cu3O6 + δ (δ∼0.1) compounds did not indicate superconductivity. The oxygen-deficient compounds exhibit the underdoped state due to the low hole concentration.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1022627127399
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