Hole distribution in underdoped and overdoped Y(Ba{sub 2{minus}y}Sr{sub y})Cu{sub 3}O{sub 6+{delta}} compounds studied by X-ray absorption spectroscopy
- National Taiwan Univ., Taipei (Taiwan, Province of China). Dept. of Chemistry
- Synchrotron Radiation Research Center, Hsinchu (Taiwan, Province of China)
The hole distribution of underdoped and overdoped states in the Y(Ba{sub 2{minus}y}Sr{sub y})Cu{sub 3}O{sub 6+{delta}} ({delta} {approximately} 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(Ba{sub 2{minus}y}Sr{sub y})Cu{sub 3}O{sub 6+{delta}} ({delta} {approximately} 0.9) compounds gives rise to high hole concentrations within both the CuO{sub 2} 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(Ba{sub 2{minus}y}Sr{sub y})Cu{sub 3}O{sub 6+{delta}} ({delta} {approximately} 0.1) compounds did not indicate superconductivity. The oxygen-deficient compounds exhibit underdoped state due to the low hole concentration.
- OSTI ID:
- 321102
- Journal Information:
- Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 21 Vol. 37; ISSN 0020-1669; ISSN INOCAJ
- Country of Publication:
- United States
- Language:
- English
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