Abstract
The effect of hydrostatic pressure up to 12 kbar on the electrical resistance in the basal ab-plane of optimally oxygen-doped (δ<0.1) single crystals Y1–xPrxBa2Cu3O7–δ moderately doped with praseodymium (x≈0.23) with a critical temperature Tc≈67 K. Compared to undoped single-crystal YBa2Cu3O7–δ, doping with praseodymium led to a decrease in the critical temperature by ≈24 K with a simultaneous increase in ρab (300 K) by ≈130 μΩcm. In the region of the transition to the superconducting state, several clearly pronounced peaks are observed on the dρ/dT – T curves, which indicates the presence of several phases with different critical temperatures in the sample. The application of high hydrostatic pressure leads to an increase in Tc by about 3 K. This increase slows down with increasing pressure, and the baric derivatives, dTc/dP, decrease from 0.44 K/kbar at atmospheric pressure to 0.14 K/kbar at 11 kbar. The comparatively weak change in the critical temperature under the action of hydrostatic pressure is due to the relatively small value of the orthorhombic distortion, (a–b)/a. The change in the baric derivative dTc/dP upon all-round compression of the sample is due to the fact that, along with an increase in the Debye temperature, the matrix element of the electron-phonon interaction also increases. Possible mechanisms of the effect of high pressure on Tc are discussed taking into account the presence of features in the electronic spectrum of carriers.
Highlights
The use of high hydrostatic pressures continues to be one of the most popular techniques for studying the structural and magnetoresistive characteristics of hightemperature superconducting cuprates (HTSC) [1, 2]
In the present study we investigate the effect of hydrostatic pressure on the electrical resistivity in the basal plane of Y1-xPrxBa2Cu3O7-δ single crystals with an average (х≈0.23) concentration of praseodymium and a critical temperature Tc≈67 K
In comparison with undoped single-crystal YBa2Cu3O7-δ samples [16*], the critical temperature decreased by 24 K with a simultaneous increase in ρab(300 К) by ≈130 μOhm·cm, which generally agrees with the literature [8,15]
Summary
Исследовано влияние гидростатического давления до 12 кбар на электрическое сопротивление в базисной abплоскости оптимально допированных кислородом (δ
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