Abstract
The temperature dependence of the thermoelectric power in samples of Y1−x PrxBa2Cu3Oy (x=0−0.6) is investigated. The principal parameters of the system of charge carriers are determined on the basis of an analysis of this dependence within a narrow-conduction-band model, and their variation with increasing praseodymium content is analyzed. It is found that an increase in x leads to a very weak increase in the electron filling and considerable broadening of the conduction band accompanied by strong localization of the charge carriers. It is concluded on the basis of a comparative analysis of the results obtained and data for the YBa2Cu3Oy system in the case of aliovalent substitutions in the barium and copper sites that the valence of praseodymium in Y1−x PrxBa2Cu3Oy is very close to 3+. It is shown that there is a universal correlation between the effective width of the conduction band and the critical temperature following various cation substitutions in the Y-Ba-Cu-O system. It is concluded that the main reason for suppression of the superconducting properties of Y1−x PrxBa2Cu3Oy is the strong modification of the band spectrum caused by praseodymium.
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Fiz. Tverd. Tela (St. Petersburg) 39, 1520–1525 (September 1997)
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Gasumyants, V.É., Vladimirskaya, E.V. & Patrina, I.B. Analysis of the possible reasons for the suppression of superconductivity in the Y1−x PrxBa2Cu3Oy system on the basis of thermoelectric power data. Phys. Solid State 39, 1352–1357 (1997). https://doi.org/10.1134/1.1130077
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DOI: https://doi.org/10.1134/1.1130077