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<p>Experimental temperature dependences of electrical resistivity in Y<sub>0.66</sub>Pr<sub>0.34</sub>Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7–δ</sub> high-temperature superconducting (HTSC) single crystals in the normal state (<i>T</i>* ≤ <i>T</i> ≤ 300&#xa0;K and 0 ≤ <i>P</i> ≤ 1 GPa) are approximated by the scattering of charge carriers by phonons and impurities model (Bloch-Grüneisen model). The pseudogap opening temperature, <i>T*</i>, corresponds to the temperature of the minimum of the high-temperature derivative,<i> d</i>ρ(<i>T</i>)/<i>dT</i>, which separates the low and the high-temperature maxima, which differ significantly in height. <i>T*</i> increases with increasing hydrostatic pressure (P), i.e., the region of fluctuation conductivity expands by increasing pressure. The presence of the high-temperature maximum <i>d</i>ρ(<i>T</i>)/<i>dT</i> is provided for in the Bloch-Grüneisen model. Extrapolation of conductivity (within the Bloch-Grüneisen model) to the region <i>T</i><sub><i>c</i></sub> &lt; <i>T</i> ≤ <i>T</i>* allowed us to calculate fluctuation conductivity, which is described with good accuracy by the Lawrence–Doniach model taking into account the heterogeneity of the sample. The baric dependences of the parameters of the Lawrence–Doniach model show that hydrostatic pressure contributes to the improvement of the sample structure.</p>

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Bloch-Grüneisen formula and fluctuation conductivity in Y1–zPrzBa2Cu3O7–δ single crystals under pressure

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  • 发表日期：

    2025年6月21日

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  • G. Ya. Khadzhai,
  • I. Goulatis,
  • A. Chroneos,
  • V. M. P. Simoes,
  • R. V. Vovk

摘要

Experimental temperature dependences of electrical resistivity in Y0.66Pr0.34Ba2Cu3O7–δ high-temperature superconducting (HTSC) single crystals in the normal state (T* ≤ T ≤ 300 K and 0 ≤ P ≤ 1 GPa) are approximated by the scattering of charge carriers by phonons and impurities model (Bloch-Grüneisen model). The pseudogap opening temperature, T*, corresponds to the temperature of the minimum of the high-temperature derivative, dρ(T)/dT, which separates the low and the high-temperature maxima, which differ significantly in height. T* increases with increasing hydrostatic pressure (P), i.e., the region of fluctuation conductivity expands by increasing pressure. The presence of the high-temperature maximum dρ(T)/dT is provided for in the Bloch-Grüneisen model. Extrapolation of conductivity (within the Bloch-Grüneisen model) to the region Tc < T ≤ T* allowed us to calculate fluctuation conductivity, which is described with good accuracy by the Lawrence–Doniach model taking into account the heterogeneity of the sample. The baric dependences of the parameters of the Lawrence–Doniach model show that hydrostatic pressure contributes to the improvement of the sample structure.