Calcium effect on the Nernst coefficient in double-substituted Y1-xCaxBa2Cu2.8Zn0.2Oy

Zhang Xunpeng; Vitaliy E. Gasumyants

doi:10.33910/2687-153X-2025-6-2-59-68

Authors

Zhang Xunpeng Peter the Great St. Petersburg Polytechnic University https://orcid.org/0009-0009-7721-5425
Vitaliy E. Gasumyants Peter the Great St. Petersburg Polytechnic University; Herzen State Pedagogical University of Russia https://orcid.org/0000-0002-5306-6738

DOI:

https://doi.org/10.33910/2687-153X-2025-6-2-59-68

Keywords:

Y-based HTSC, doping, Nernst coefficient, narrow-band model, energy spectrum, charge carrier mobility

Abstract

We present experimental results on the temperature dependence of the Nernst coefficient in the normal state of the system Y_1-xCa_xBa₂Cu_2.8Zn_0.2O_y, analyzed quantitatively using a narrow-band model jointly with temperature dependences of the thermopower. From this analysis, we determine the charge carrier mobility across all studied samples and then analyze its variation with increasing calcium content. It is shown that all experimental and calculated results can be explained if we take into account that both calcium and zinc directly affect the structure of the band responsible for the conduction process in the YBa₂Cu₃O_ysystem. Calcium introduced into the lattice compensates for local disturbances in the electronic structure created by zinc, as a result of which the values of all parameters of the normal state at x ≥ 0.125 become close to the ones characteristic of undoped YBa₂Cu₃O_y.

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Calcium effect on the Nernst coefficient in double-substituted Y1-xCaxBa2Cu2.8Zn0.2Oy

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