Antiferromagnetic and superconducting correlations on the d-p model

作者：Koikegami S^*; Yamada K

来源：Journal of the Physical Society of Japan, 2000, 69(3): 768-776.

DOI：10.1143/JPSJ.69.768

• quasi-two-dimensional d-p model
• high-T-c superconducting cuprates
• fluctuation exchange approximation
• t-matrix approximation

We study superconducting fluctuation effects on the quasi-two-dimensional d-p, model, which can describe significant features of high-T-c superconducting cuprates. We adopt the fluctuation exchange approximation in order to derive both normal and anomalous vertices of renormalized d-electron propagators, and then solve the Bethe-Salpeter equation for the anomalous vertex and derive t-matrix as a superconducting fluctuation propagator. We calculate the normal d-electron self-energy self-consistently, and get a self-consistent solution for the circumstance in which the system is close to both antiferromagnetic and superconducting instabilities. The solution exhibits the suppression of the density of states near (+/-pi, 0) and (0, +/-pi), which reflects the experimental result on the normal state of underdoped cuprates.

• 出版日期2000-3