Abstract
On the basis of the two-dimensional d–p model, we analyze the correlations among the d-electrons. We adopt the fluctuation exchange approximation in order to derive both normal and anomalous vertices composed only of the renormalized d-electron propagators and the on-site repulsive interaction among the d-electrons. And then we solve the Bethe–Salpeter equation to derive the t-matrix as a superconducting fluctuation propagator. We calculate the normal d-electron self-energy self-consistently, and get self-consistent solutions in which the system is close to an antiferromagnetic instability. In our solutions the superconducting fluctuation couples strongly with the d-electron and it causes the anomalous behavior in the temperature dependences of the magnetic correlations of the d-electrons.
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