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Mechanism governing modification of the properties of the normal state and the critical temperatures under codoping of YBa2Cu3Oy by calcium and praseodymium

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Abstract

The temperature dependences of the electrical resistivity and thermopower coefficient in the Y1−2x CaxPrxBa2Cu3Oy system are studied experimentally, and their analysis is performed in the light of earlier data on the effect of separate calcium and praseodymium doping in yttrium sites. It is found that codoping calcium and praseodymium ions into the lattice does not result in summation of the individual effects of the dopants on either the critical temperature or the temperature dependences of the thermopower coefficient. The results obtained are analyzed within the narrow band model, and the parameters of the band structure and charge carrier system in the samples are determined. The character and mechanism of variation in these parameters with increasing doping level are examined. It is suggested that interaction of calcium with praseodymium ions weakens the effect of hybridization of band states with praseodymium ion states through the involvement of additional states introduced by calcium into the conduction band. This assumption accounts for all the features revealed in the variation of the properties of the normal state and the critical temperature with increasing doping level.

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Authors and Affiliations

  1. St. Petersburg State Polytechnical University, Politekhnicheskaya ul. 29, St. Petersburg, 195251, Russia

    O. A. Martynova & V. É. Gasumyants

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  1. O. A. Martynova
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  2. V. É. Gasumyants
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Original Russian Text © O.A. Martynova, V.É. Gasumyants, 2006, published in Fizika Tverdogo Tela, 2006, Vol. 48, No. 7, pp. 1157–1163.

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Martynova, O.A., Gasumyants, V.É. Mechanism governing modification of the properties of the normal state and the critical temperatures under codoping of YBa2Cu3Oy by calcium and praseodymium. Phys. Solid State 48, 1223–1229 (2006). https://doi.org/10.1134/S106378340607002X

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  • DOI: https://doi.org/10.1134/S106378340607002X

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