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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4486

Title: Thermoelectric power studies on Nd1.82-xSrxCe0.18CuOy:x<=0.18 superconductors
Authors: SINGH, OG
PADALIA, BD
PRAKASH, O
AGARWAL, SK
NARLIKAR, AV
Keywords: electron-phonon interaction
oxide superconductors
thermal-conductivity
transport-properties
charge-carriers
cu-o
thermopower
nd2-xcexcuo4-y
system
model
Issue Date: 1996
Publisher: AMER INST PHYSICS
Citation: JOURNAL OF APPLIED PHYSICS, 80(9), 5169-5174
Abstract: Thermoelectric power (S) studies on a Nd1.82-xSrxCe0.18CuOy:x less than or equal to 0.18 superconducting system in the temperature range 35-250 K are reported here. In the x=0.09 sample, synthesized in the reduced environment, the small magnitude of S is highly metalliclike and its sign is negative, a characteristic of electron conduction. The sign of S for the x=0.18 sample shows a crossover below 75 K from negative to positive, in apparent conflict with electronic conduction. Interestingly, after oxygenation this sample exhibits a broadened but positive phonon draglike peak. This oxygenated sample shows overcompensation of the carrier (electron) concentration. Critical analysis of the data suggests that Sr doping seemingly causes a competition between electron- and holelike conduction. The slope dS/dT is, in general, negative suggesting that the main contribution is coming from the diffusive part. The observed thermopower features seem to fall in line with the theoretical curves of Durczewski and Ausloos [Z. Phys. B 85, 59 (1991); Phys. Rev. B 53, 1762 (1996)] based on the inelastic scattering of quasifree electrons by phonons. (C) 1996
URI: http://dx.doi.org/10.1063/1.363500
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4486
http://hdl.handle.net/10054/4486
ISSN: 0021-8979
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