Pseudogap Induced by Superconducting Fluctuation in the d-p Model

TL;DR

This paper investigates how superconducting fluctuations induce a pseudogap in the d-p model, affecting the phase diagram of high-Tc superconductors, and compares theoretical results with experimental observations.

Contribution

It demonstrates the role of superconducting fluctuation-induced pseudogap in the phase diagram using the d-p model with spin fluctuation-mediated pairing.

Findings

The pseudogap causes a maximum and sharp drop in 1/T1T in the underdoped region.

The evolution of the pseudogap aligns with ARPES experimental results.

Calculated Tc and spectral features support the pseudogap's influence on high-Tc phase diagrams.

Abstract

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.