Pseudogap Induced by Superconducting Fluctuation in the d-p Model.

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  • Kobayashi Akito
    Department of Physics, Nagoya University, Nagoya 464–8602 CREST, Japan Science and Technology Corporation (JST)
  • Tsuruta Atsushi
    Department of Physics, Nagoya University, Nagoya 464–8602
  • Matsuura Tamifusa
    Department of Physics, Nagoya University, Nagoya 464–8602
  • Kuroda Yoshihiro
    Department of Physics, Nagoya University, Nagoya 464–8602 CREST, Japan Science and Technology Corporation (JST)

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  • Pseudogap Induced by Superconducting Fluctuation in the<i><i>d</i></i>-<i><i>p</i></i>Model

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Using the d-p model, we demonstrate that the pseudogap, which is induced by the superconducting fluctuation, plays key roles in the determination of the phase diagram observed in high-Tc superconducting materials. We take the pairing interaction mediated by the spin fluctuation and calculate the superconducting transition temperature Tc, the NMR relaxation rate 1/T1 and the single-particle spectrum by treating both the superconducting fluctuation and spin fluctuation in a consistent fashion. As temperature decreases, 1/T1T increases at high temperatures, and it reaches a maximum followed by a sharp drop in the underdoped region, due to the evolution of the pseudogap in the single-particle spectrum. The evolution is also consistent with those of ARPES experiments.

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