Abstract
Our analysis of the orbital magnetic susceptibility χ of the attractive Hubbard model, above the superconducting transition temperature T c, is based on the usual T-matrix approximation to the electronic self-energy. In this framework the one-electron Green's function is coupled to virtual pair fluctuations. The linear response of the electronic current to an external vector potential A , which yields χ, obeys a linear integral equation. The attraction between electrons has three effects: (a) a renormalized group velocity appears in the coupling of the electrons to A ; (b) the electrons interact with each other by exchanging bosonic pair excitations; (c) there is a direct coupling of the virtual pairs to A . The pair contribution to χ has the same structure as the one obtained in a Landau–Ginzburg approach in Gaussian approximation, but differs in some details from the latter.
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