Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-06-02
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, to be published in Journal of the Physical Society of Japan, Vol.69 (2000) No.7
Scientific paper
10.1143/JPSJ.69.1950
We analyze the two-dimensional {\it d-p} model, considering both antiferromagnetic spin fluctuation and $d_{x^2-y^2}$-wave superconducting fluctuation. We adopt the fluctuation-exchange approximation in order to derive both normal and anomalous vertices composed only of the renormalized {\it d}-electron Green function and the on-site repulsive interaction among the {\it d}-electrons. Using these vertices, we derive a $t$-matrix as a superconducting fluctuation propagator. Then, we obtain self-consistent solutions in which the system is close to antiferromagnetic instability. In our solutions, the superconducting fluctuation couples strongly with the quasiparticle state and this causes the anomalous behavior in the temperature dependences of spin susceptibility and specific heat.
Koikegami Shigeru
Yamada Kosaku
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