Funct. Mater. 2022; 29 (3): 346-358.

doi:https://doi.org/10.15407/fm29.03.346

Influence of pressure on the critical temperature and resistivity of Y_0.77Pr_0.23Ba₂Cu₃O_7-δ single crystals

G.Ya.Khadzhai¹, Junyi Du^1,2, Z.F.Nazyrov¹, A.L.Solovyov¹, N.R.Vovk¹, R.V.Vovk^1,3

¹V.N.Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
²School of Mathematical Sciences, Luoyang Normal University, 471934 Luoyang, China
³Ukrainian State University of Railway Transport, 7 Feyerbaha Sq., 61050 Kharkiv, Ukraine

Abstract:

In the present work, we investigated the influence of high hydrostatic pressure up to 11 kbar on the conductivity in the basal ab-plane of Y_1-xPr_xBa₂Cu₃O_7-δ single-crystalline samples medium-doped with praseodymium (x~0.23). It was found that, in contrast to the pure YBa₂Cu₃O_7-δ with the optimal oxygen content, the application of high pressure leads to phase separation in the basal plane of Y_0.77Pr_0.23Ba₂Cu₃O_7-δ single crystals. Possible mechanisms of the effect of praseodymium doping and high pressure on the two-step transition to the superconducting state are discussed. It was established that in the normal state, there is a conductivity of the metallic type, limited by the scattering of phonons (Bloch-Gruneisen regime) and defects. The fluctuation conductivity is considered within the Lorentz-Doniach model. Hydrostatic pressure, accompanied by a decrease in anisotropy, leads to a decrease in the residual and phonon resistances. The Debye temperature and coherence length are independent of pressure. The applicability of the McMillan formula in the presence of significant anisotropy is discussed. The excess conductivity Δσ(T) obeys an exponential temperature dependence in the broad temperature range T_f < T < T^*. The dependence Δσ(T) ~ (1 - T/T^*)expΔ^*_ab/T) is interpreted in terms of the mean-field theory, where T^* is the mean-field temperature of transition to the pseudogap state; and the temperature dependence of the pseudogap is satisfactory described within the BCS-BEC crossover theory.

Keywords:

YPrBaCuO single crystals, doping, hydrostatic pressure, anisotropy, excess conductivity, scattering, Debye temperature.

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Funct. Mater. 2022; 29 (3): 346-358.

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