Peculiarities of pseudogap in Y(0.95)Pr(0.05)Ba(2)Cu(3)O(7−δ) single crystals under pressure up to 1.7 GPa

The effect of hydrostatic pressure up to P = 1.7 GPa on the fluctuation conductivity σ′(T) and pseudogap ∆*(T) in Y(0.95)Pr(0.05)Ba(2)Cu(3)O(7−δ) single crystal with critical temperature Т(с) = 85.2 K (at P = 0) was investigated. The application of pressure leads to the increase in T(c) with dT(c)/dP = +1.82 K∙GPa(−1) while the resistance decreases as dlnρ(100 K)/dP = −(10.5 ± 0.2) %∙GPa(−1). Regardless of the pressure, in the temperature interval from T(c) to T(0) (~88 K at P = 0) the behaviour of σ′(T) is well described by the Aslamazov – Larkin (AL – 3D) fluctuation theory, and above the T(0) by the Lawrence – Doniach theory (LD). The Maki-Thompson (MT – 2D) fluctuation contribution is not observed. This indicates the presence of structural defects in the sample induced by Pr. Here it is determined for the first time that when the pressure is applied to the Y(1−x)Pr(x)Ba(2)Cu(3)O(7−δ) single crystal, the pseudogap increases as dlnΔ*/dP = 0.17 GPa(–1).