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Thermoelectric power and resistivity of Nd1-xCaxBa2Cu3Oy and Nd1-xLaxBa2Cu3Oy
KTH, Superseded Departments, Physics. (Fasta tillståndets fysik)
KTH, Superseded Departments, Physics. (Fasta tillståndets fysik)ORCID iD: 0000-0002-9858-6235
KTH, Superseded Departments, Physics. (Fasta tillståndets fysik)
Arrheniuslaboratoriet, Stockholms Universitet. (Oorganisk kemi)
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2000 (English)In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 339, no 4, 245-252 p.Article in journal (Refereed) Published
Abstract [en]

The structural and transport properties of Nd1-xCaxBa2Cu3Oy (x = 0.0, 0.03, 0.06, and 0.10) and Nd1-xLax- Ba2Cu3Oy. (x nominally 0.0, 0.05, 0.10, and 0.15) have been studied by X-ray powder diffraction, electrical resistivity, and thermoelectric power measurements. In both series, the a- and b-axis lattice parameters decrease with increasing doping while the c-axis lattice parameter increases. The transport properties suggest improved metallic behaviour with increasing Ca doping in contrast to La doping. An anomalous sharp peak in the thermoelectric power close to T-c was observed, which depended on the doping content. We analysed the thermoelectric power as a function of temperature with a two-band model with an additional linear T term. An excellent agreement between model and data was obtained.

Place, publisher, year, edition, pages
2000. Vol. 339, no 4, 245-252 p.
Keyword [en]
thermoelectric power, NdBa2Cu3, substitution, superconducting transition, oxygen stoichiometry, normal-state, temperature, tc, yba2cu3o7-delta, thermopower, charge, system
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-20154DOI: 10.1016/S0921-4534(00)00346-4ISI: 000165260800004OAI: diva2:338847
QC 20100525 20111205Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-12-05Bibliographically approved

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Ghorbani, Shaban RezaAndersson, MagnusLundqvist, PieterRapp, Östen
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