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本文由超导体强耦合能隙方程出发,对64种有效声子谱求得了近3500个临界温度的数值解。它们说明,在谱面积A不变时,Tc具有条件极值(Tc/A)max。Tc主要取决于α2F(ω)上峰的位置及其面积,与峰的宽度关系不大。控制及2>两个参量时,用双δ谱来代替L谱所产生的误差为3.2％。本文分析并澄清了文献中关于“λ=2极限”的争论。Results of some 3500 numerical solutions of Tc for 64 different effective phonon spectrum a2F(ω) are presented. It can be seen from these results that the Tc has the conditional maximum (Tc/A)max, if the area of spectrum is unchanged. Tc depends chiefly on the position and area of the peak of spectrum. Its dependence on the peak width is comparatively unimportant. If the double δ spectrum is replaced by the double ω spectrum with same and 2>, the rms error is 3.2%. In this paper I analysis and settle the dispute regarding the "λ=2 limit" in the literature.
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