Theory of magnetic impurities in superconductors. I
Theory of magnetic impurities in superconductors. I
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超导体中的磁性杂质理论。
DOI：
10.1007/bf01394943
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发表时间：
1970
期刊：
影响因子：
--
通讯作者：
E. Müller
中科院分区：
文献类型：
--
作者：
J. Zittartz;E. Müller
精确地求解了超导体的长冈格林函数方程，并明确地回答了禁带内束缚态的问题。结果表明，总有两个束缚态相对于能隙中心对称地分布。对于铁磁耦合，γ>；0，以及对于反铁磁耦合，但Tk≫Tc0或Tk≪Tc0，这些束缚态非常接近带隙边缘。然而，对于Tk∼Tc0，束缚态向禁带中心移动。指出在后一种情况下，应该发生与Abrikosov-Gorkov理论的重要偏离，即近藤效应的表现，这可以通过研究态密度来进行实验验证。
The Nagaoka Green's functions equations for a superconductor are solved exactly and the question of bound states within the gap is answered unambiguously. It is shown that there are always two bound states symmetrically located with respect to the center of the gap. For ferromagnetic coupling,γ>0, and for antiferromagnetic coupling, butTK≫Tc0orTK≪Tc0, these bound states are very close to the gap edges. ForTK∼Tc0, however, the bound states move towards the center of the gap. It is pointed out that in the latter case important deviations from the Abrikosov-Gorkov theory, i.e. manifestations of the Kondo effect, should occur which could be tested experimentally by investigating the density of states.