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本文提出了描述复合颗粒超导体的壳层模型.此模型把复合颗粒分为壳层和内核两部分来处理。根据解非均匀体系Eliashberg方程的结论,对两部分谱函数进行权重相加,用对弱强耦合超导体都适用的Louie和Cohen临界温度Tc的公式,计算了Pb,Sn,In等不同尺寸复合颗粒的Tc。计算结果与实验基本符合。与已有的理论计算不同,我们的计算给出了Pb的Tc随尺寸减小而下降的结果。The present paper has proposed a shell model to describe clad particles of superconductors. The model describes the particles as consist of two parts, i.e. a shell part and a nuclei part. According to the conclusion of the solution of Eliashberg equation in inhomogeneous systems we add the spectrum functions of the two parts together with specific weights. We have calculated the Tc of Pb, Sn, In clad particles with different sizes by the Louie and Cohen's critical temperature Tc fomula which is valid to both weak and strong coupling superconductors. The calcutated results are in agreement with experimental data which have been published so far. In contrast to other authors' calculated results, our results give conclusion which shows that the Tc of Pb clad particles decreases when the size of the particles is reduced.
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