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Possible competitive electron- and hole-like conduction in the revived Nd1.82Ce0.18CuOy superconductors

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Title Possible competitive electron- and hole-like conduction in the revived Nd1.82Ce0.18CuOy superconductors
 
Creator OKRAM, GS
PADALIA, BD
PRAKASH, O
AGARWAL, SK
NARLIKAR, AV
 
Subject thermoelectric-power
oxide superconductors
transport-properties
charge-carriers
thermopower
thermoelectric power
electron-doped superconductor
electronic structure
electronic transport
 
Description Thermoelectric power (S) studies on the nominally electron-doped Nd1.82-zSrzCe0.18CuOy (NSCCO) superconductor system in the temperature range 35 K to 250 K are reported here, S of the reduced z = 0.09 sample has negative sign, indicating electron conduction, and has small magnitude, showing high metallicity. The sign of S for the z = 0.18 sample however shows a cross-over below 75 K, from negative to positive, conflicting perhaps with electronic conduction, This sample on oxygenation exhibits broadened positive peak and apparently gets carrier concentration enhanced. There is seemingly a competition between electron and hole-like conduction in these co-doped compounds also.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-26T11:39:34Z
2011-12-26T12:54:15Z
2011-12-27T05:41:53Z
2011-07-26T11:39:34Z
2011-12-26T12:54:15Z
2011-12-27T05:41:53Z
1997
 
Type Article
 
Identifier PHYSICA C, 277(1-2), 19-23
0921-4534
http://dx.doi.org/10.1016/S0921-4534(97)00042-7
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6892
http://hdl.handle.net/10054/6892
 
Language en