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X-ray absorption near edge structure study of T '-type revived superconducting compounds, Nd(1.82-z)A(z)Ce(0.18)CuO(y) (NACCO), A = Ca, Sr or Ba, z <= 0.18

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Title X-ray absorption near edge structure study of T '-type revived superconducting compounds, Nd(1.82-z)A(z)Ce(0.18)CuO(y) (NACCO), A = Ca, Sr or Ba, z
 
Creator PADALIA, BD
OKRAM, GS
PRAKASH, O
SUBA, R
GUPTA, S
GURMAN, SJ
AMISS, JC
 
Subject electronic-structure
charge-carriers
nd2-xcexcuo4-y
photoemission
reduction
 
Description Effects of the substitution of divalent A (Ca, Sr or Ba) ion in Ce excess non-superconducting Nd1.82Ce0.18CuO4.09 compound, leading to revival of superconductivity, are studied by measuring absorption edges of all the cations with synchrotron radiation. It is found that in these NACCO samples, Cu exists mainly in the 2+ state; the weak pre-edge feature near the Cu+ position is marginally affected due to A(2+) ions. Except for the case of Pa doping, a fall in the intensity of the white line at the Cu K-edge is observed. This is attributed to a decrease in lattice oxygen content (oxygen vacancy creation) leading to an increase in electron carriers. It is noted that when the effective charge on Cu is less than or equal to 1.88, the T'-type samples are superconducting.
 
Publisher IOP PUBLISHING LTD
 
Date 2011-08-04T03:12:10Z
2011-12-26T12:54:31Z
2011-12-27T05:42:30Z
2011-08-04T03:12:10Z
2011-12-26T12:54:31Z
2011-12-27T05:42:30Z
1998
 
Type Article
 
Identifier SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 11(12), 1381-1385
0953-2048
http://dx.doi.org/10.1088/0953-2048/11/12/005
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9227
http://hdl.handle.net/10054/9227
 
Language en