The effect of high pressure on the conductivity in the basal plane of HTSC single crystals of Y_0.77Pr_0.23Ba₂Cu₃O_7−δ is investigated. It has been established that the excess conductivity, Δσ(T), of these single crystals in a wide temperature range T_f < T < T* can be described by an exponential temperature dependence. The description of the excess conductivity using the relation Δσ ~ (1 − T/T*)exp(Δ*_ab/T) can be interpreted in terms of the mean-field theory, where T* is represented as the temperature pseudogap opening, and the temperature dependence of the pseudogap (PG) is satisfactorily described in the framework of the BCS-BEC crossover theory. An increase in the applied pressure leads to the effect of narrowing the temperature interval for the realization of the PG-regime, thereby expanding the region of the linear dependence ρ(T) in the ab-plane.

高压对Y中的HTSC单晶的基底面的导电性的效果_0.77镨_0.23的Ba ₂的Cu ₃ ö _{7- δ}进行了研究。已经确定的是，这些单晶在宽温度范围T _f  <  T  <  T *时的过剩电导率Δσ（T）可以通过指数温度依赖性来描述。使用关系Δσ〜  （1  -  T / T *）exp（Δ* _ab / T）可以用平均场理论来解释，其中T *表示温度伪间隙开口，在BCS-BEC交叉理论的框架中令人满意地描述了伪间隙（PG）的温度依赖性。所施加的压力的增加导致缩小用于实现PG区域的温度间隔的效果，从而扩大了ab平面中的线性相关性ρ（T）的区域。