Flow-Equation method for a superconductor with magnetic correlations

Details Flow-Equation method for a superconductor with magnetic correlations Flow-Equation method for a superconductor with magnetic correlations

1998-06-26

arxiv.org/abs/cond-mat/9806326v1

Physics

Condensed Matter

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Scientific paper

The flow equation method has been used to calculate the energy of single impurity in a superconductor for the Anderson model with $U \neq 0$. We showed that the energy of the impurity depends only of the $\Delta^{2}_{R}$ (renormalized order parameter) which depends on the renormalized Hubbard repulsion$U^R$. For a strong Hubbard repulsion $U^R = U$ and $\Delta^R = \Delta ^I$ the effect of the $s-d$ interactions are nonrelevant, a result which is expected for this model.

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