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- W2080794665 abstract "Abstract The localized excited state (LES) within the superconducting gap is investigated by applying the 1/ N -expansion method with the slave-boson and the pseudo-fermion. The LES is obtained by examining a pole of the t -matrix. The most dominant terms of the t -matrix are of the order of (1/ N ) 0 for T K /Δ T K /Δ >a, all of the higher-order terms of the type (1/ N √Δ 2 -ω 2 ) n ( n is a positive integer) are also essential because they are of the order of (1/ N ) 0 at ω =± ω 0 (the pole of the t -matrix). At T K /Δ⪡1, the LES appears near the gap edge, at T K /Δ≈ O (1) it crosses zero and approaches the gap edge again at T K /Δ⪡1. The residue of the LES is 1 2 (singlet) at T K /Δ⪡ 1 and 2 (doublet) at T K /Δ⪢ 1 in the case of N =2. These results coincide with those of the numerical calculation using the renormalization group." @default.
- W2080794665 created "2016-06-24" @default.
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- W2080794665 date "1993-09-01" @default.
- W2080794665 modified "2023-09-27" @default.
- W2080794665 title "The localized excited state in a superconductor due to magnetic impurity" @default.
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- W2080794665 doi "https://doi.org/10.1016/0921-4534(93)90842-e" @default.
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