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|Title:||X-ray absorption spectroscopic studies of the T '-type Gd1.85-xPrxCe0.15CuOy system|
|Publisher:||ELSEVIER SCIENCE BV|
|Citation:||PHYSICA C, 292(3-4), 183-188|
|Abstract:||X-ray absorption near edge structure (XANES) studies on the T'-type Gd1.85-xPrxCe0.15CuOy; x = 0.00, 1.10, 1.35 and 1.85 are carried out. The Pr L-3-, Ce L-3- and Cu K-absorption edge regions in these compounds have been measured. Pr in the reduced superconducting (SC) samples is found to be in 3+ state, while in the oxygenated non-SC samples, signatures of both Pr3+ and Pr4+ are observed. Ce remains throughout in the mixed (3+, 4+) valent state. As the Pr concentration (x) in the reduced samples is increased, the unoccupied DOS, as reflected by intensity of the white line at the Cu K-edge, decreases. This is attributed to an increase in the electron density due to the creation of oxygen vacancies. (C) 1997|
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