STRONG-COUPLING SUPERCONDUCTOR AT NONZERO TEMPERATURE
STRONG-COUPLING SUPERCONDUCTOR AT NONZERO TEMPERATURE
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非零温强耦合超导体
DOI：
10.1103/physrevlett.14.102
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发表时间：
1965
影响因子：
8.6
通讯作者：
J. Swihart
中科院分区：
文献类型：
--
作者：
D. Scalapino;Y. Wada;J. Swihart
在这些计算中，有效的电子-电子相互作用用延迟的修饰声子交换和静态库仑赝势来表示。在本文中，我们把这些计算推广到非零温度，并且(1)用哈里森提出的矩阵元的近似形式计算了铅的有效电子-声子耦合常数；(2)确定了非零温度下能隙函数的频率依赖性；(3)讨论了由复合过程引起的态的有效隧穿强度的反常。
in good agreement with the experimentally measured tunneling anomaly near zero temperature.''In these calculations, the effective electron-electron interaction was represented by a retarded dressed-phonon exchange and a static Coulomb pseudopotential. In this Letter we extendthese calculations to nonzero temperatures and (1) evaluate the effective electron-phonon coupling constant for Pb using an approximate form of the ma-trix element suggested by Harrison';(2) de-termine the frequency dependence of thegap function at nonzero temperature; and (3) dis-cuss an anomaly in the effective tunneling den-sity of states arising from recombination pro-cesses.