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本文指出,对于实际的归一化有效声子谱函数g(ω),一般来说,zph≡F(-ωph-2是函数z=F(y)≡∫0(ωph)(ω2y)/(ω2y+1)g(ω)dω的反函数的分支点。因此,在估算超导Tc级数的收敛半径时,应当予以考虑。It is pointed out that zph≡F(-ωph-2 is generally a branch point of the inverse function of the function z=F(y)≡∫0(ωph)(ω2y)/(ω2y+1)g(ω)dω, where g(ω) is the normalized effective phonon spectral function of the system. There-fore it should be taken into account in evaluating the radius of convergence of the series for superconducting critical temperature of the system.
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