INFLUENCE OF PRESSURE ON THE SCATTERING OF NORMAL AND FLUCTUATION CARRIERS IN Y0.66Pr0.34Ba2Cu3O7-δ SINGLE CRYSTALS

  • G. Ya. Khadzhai V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0000-0002-1257-8702
  • V. Yu. Gres V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0000-0002-2085-8042
  • M. V. Korobkov V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
  • V. F. Korshak V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0000-0001-5957-3186
  • R. V. Vovk V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0000-0002-9008-6252
DOI: https://doi.org/10.26565/2222-5617-2025-43-03
Keywords: Y0.66Pr0.34Ba2Cu3O7–δ single crystals, ab-plane resistivity, heterogeneity, hydrostatic pressure, phonon carrier scattering, fluctuation conductivity, 2D-3D crossover

Abstract

The experimentally obtained temperature dependences of the electrical resistance, ρ(T), of the single-crystal high-temperature superconductor (HTSC) Y0.66Pr0.34Ba2Cu3O7–δ in the normal state (T* ≤ T ≤ 300 K) at different values of quasi-hydrostatic pressure     (0 ≤ P ≤ 1 GPa) are approximated by the Bloch–Grüneisen relation, which takes into account the scattering of charge carriers on phonons and defects. The temperature derivative of the resistance, dρ(Т)/dT, in the normal state passes through a maximum (Tmax ≈ θ/3, θ is the Debye temperature), which fully corresponds to the model used. The presence of a high-temperature maximum dρ(Т)/dT indicates the absence of a linear dependence of the electrical resistance in the studied sample at least in the region T ≲ 300 K. The superconducting transition leads to the appearance of a low-temperature maximum at T = Tc. The temperature of the minimum between these maxima is identified with the pseudogap opening temperature T*. The latter increases with increasing hydrostatic pressure. Extrapolation of the normal conductivity (in the Bloch–Grüneisen model) to the temperature range Tc < T ≲ T* allows us to calculate the fluctuation conductivity. The fluctuation conductivity, obtained as the difference between the experimental resistance values and the values extrapolated using the Bloch – Grüneisen relation, is described with good accuracy by the Lorentz – Doniach relation, taking into account the inhomogeneity of the sample. The baric dependences of the parameters of the Lorentz – Doniach model show that hydrostatic pressure contributes to the improvement of the sample structure. The pressure-induced evolution of the fluctuation conductivity in Pr-doped Y0.66Pr0.34Ba2Cu3O7–δ single crystals can be determined by two circumstances: an increase in the “three-dimensionality” of the system due to a change in the ratio between the coherence length ξc and the interlayer distance d and a shift of the Fermi level relative to the features of the density of electronic states. In contrast to undoped (or lightly Pr-doped) YBCO samples, the application of high pressure leads to a significant increase in the baric derivatives, dTc/dP and dξc/dP.

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Published
2025-11-26
How to Cite
Khadzhai, G. Y., Gres, V. Y., Korobkov, M. V., Korshak, V. F., & Vovk, R. V. (2025). INFLUENCE OF PRESSURE ON THE SCATTERING OF NORMAL AND FLUCTUATION CARRIERS IN Y0.66Pr0.34Ba2Cu3O7-δ SINGLE CRYSTALS. Journal of V. N. Karazin Kharkiv National University. Series Physics, (43), 28-39. https://doi.org/10.26565/2222-5617-2025-43-03
Issue
No. 43 (2025): Journal of V. N. Karazin Kharkiv National University. Series Physics
Section
Articles

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