Investigating localized excited states and their effects in superconductors with classical spins, suggesting significant implications for observable phenomena.
It is shown that there exists a localized excited state in the energy gap in a superconductor with a classical spin. At finite concentration localized excited states around classical spins form an "impurity band". The process of growth of the "impurity band" and its effects on observable quantities are investigated.
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Hiroyuki Shiba (1968) studied this question.
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