Impurity Effect in High- T c Superconductors –A Consistent Analysis by d-Wave Superconducting Model–
Impurity Effect in High- T c Superconductors –A Consistent Analysis by d-Wave Superconducting Model–
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高温超导体中的杂质效应——d波超导模型的一致分析——
DOI：
10.1143/jpsj.63.2052
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发表时间：
1994
影响因子：
1.7
通讯作者：
K. Asayama
中科院分区：
文献类型：
--
作者：
Y. Kitaoka;K. Ishida;K. Asayama
基于d波超导模型，定量分析了YBa2Cu3O7中Zn和Ni杂质效应与Bi2Sr2CaCu2O8中掺杂诱导的无带隙超导电性之间的对比.考虑到引起无带隙超导电性的Zn杂质作为么正性或强散射体的事实，本文证明了Ni杂质并不引起无带隙超导电性，尽管它还不至于弱到用Born散射来处理。d波模型可以解释这样一个特征，即即使杂质散射使Tc适度降低，超导性也会转变为费米能级上具有有限态密度的无带隙型。
The contrast between Zn- and Ni-impurity effects in YBa 2 Cu 3 O 7 and the imperfection-induced gapless superconductivity in Bi 2 Sr 2 CaCu 2 O 8 reported previously are quantitatively analyzed based on the d -wave superconducting model. By taking account of the fact that the Zn impurity which caused the gapless superconductivity acts as a unitarity or strong scatterer, it is demonstrated that the Ni impurity does not give rise to the gapless superconductivity, although it is not so weak as to be treated in terms of Born scattering. The d -wave model can explain the characteristic feature such that even though T c is moderately reduced by impurity scattering, the superconductivity changes into the gapless type with a finite density of states at the Fermi level.