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X-ray absorption spectroscopic studies of the T '-type Gd1.85-xPrxCe0.15CuOy system

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Title X-ray absorption spectroscopic studies of the T '-type Gd1.85-xPrxCe0.15CuOy system
 
Creator GUPTA, S
SUBA, R
PADALIA, BD
PRAKASH, O
NAYAK, RM
GOPALAKRISHNAN, IK
YAKHMI, JV
 
Subject electron
oxygen
superconductivity
nonstoichiometry
oxides
nd
sm
eu
gd
th
 
Description 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
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-27T06:25:19Z
2011-12-26T12:56:07Z
2011-12-27T05:44:18Z
2011-07-27T06:25:19Z
2011-12-26T12:56:07Z
2011-12-27T05:44:18Z
1997
 
Type Article
 
Identifier PHYSICA C, 292(3-4), 183-188
0921-4534
http://dx.doi.org/10.1016/S0921-4534(97)01724-3
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7142
http://hdl.handle.net/10054/7142
 
Language en