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

Journal Article · Mon Oct 19 04:00:00 EDT 1998 · Inorganic Chemistry

DOI:https://doi.org/10.1021/ic980418m· OSTI ID:321102

Liu, R S; Chang, C Y ^[1]; Chen, J M ^[2]

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1. National Taiwan Univ., Taipei (Taiwan, Province of China). Dept. of Chemistry
2. 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

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
COPPER OXIDES
DOPED MATERIALS
HOLES
SPATIAL DISTRIBUTION
STRONTIUM OXIDES
SUPERCONDUCTORS
YTTRIUM OXIDES