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通过实例说明,超导临界温度级数的收敛半径是声子谱高频端行为的敏感量。因此,以它作A,B两类超导体分类的判据是不适宜的。On the basis of a recent discussion on the analytical properties of the first order equation for Tc, we show, by concrete examples, that the radius of convergence of the series for superconducting critical temperature is so sensitive to the high-frequency behaviors of the phonon spectral function, that it is inadequate for it to serve as a critical quantity in the criterion for dividing superconductors into type A and type B.
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