Polycrystalline samples of Y_1-xCa_xBa_2-yLa_yCu₃O_z cuprate superconductors with both x and y ranging from 0 to 0.5 were investigated. The combinative energy between the perovskite block and the rock-salt block in this codoped system was calculated according to a previously proposed “block model”. By defining a new parameter $\gamma$ describing the combined effects of the combinative energy (lattice degree of freedom) and the charge carrier density (charge degree of freedom), it is revealed that the tendency of $\gamma$ changing with doping is well consistent with that of the superconducting transition temperature (T_c) over the whole doping range, suggesting the important roles of both the lattice and charge degrees of freedom in influencing the unconventional superconductivity.

研究了x和y均在 0 到 0.5 范围内的 Y _{1- x} Ca _x Ba _{2- y} La _y Cu ₃ O _z铜酸盐超导体的多晶样品。根据先前提出的“块模型”计算了该共掺杂系统中钙钛矿块和岩盐块之间的结合能。通过定义一个新参数$\gamma$描述了组合能量（晶格自由度）和电荷载流子密度（电荷自由度）的组合效应，揭示了$\gamma$在整个掺杂范围内随掺杂的变化与超导转变温度（T _c）的变化非常一致，这表明晶格和电荷自由度在影响非常规超导性方面的重要作用。