Scenario of pseudogap in underdoped cuprate

TL;DR

This paper examines the pseudogap in underdoped cuprates, arguing that magnetic fluctuations are not the primary cause, and proposes a model involving spin density waves to explain the pseudogap's origin.

Contribution

The paper introduces a model based on spin density waves that offers a new perspective on the pseudogap formation in underdoped cuprates, challenging existing fluctuation-based theories.

Findings

Identifies new dispersion characteristics in high-temperature cuprates.

Suggests pseudogap may originate from internal properties of underdoped cuprates.

Argues fluctuation effects are not the main cause of the pseudogap.

Abstract

So far, the theories of the cuprate pseudogap may be broadly divided into two main schools of though. One is based upon the idea that view the pseudogap as deriving from some of precursor superconductivity. Another assumes that associate the pseudogap phenomena with magnetic pairing of some sort. Both the scenario of superconducting fluctuation and the scenario of magnetic pairing of some sort on the pseudogap in underdoped cuprate are based upon the idea that a fluctuation of a certain type exists at temperatures higher than the usual superconducting transition temperature and has an effect on the single particl self-energy and just such a self-energy leads to the gap-like structure of the spectral weight. In this paper we argue that although a fluctuation of a certain type has an effect on the origin of the pseudogap, it is not the crucial factor of the origin of the pseudogap in underdoped cuprate. We analysis the scenario of the pseudogap in the underdoped cuprate based on the model that can bring about the spin density wave (SDW) and find the new dispersion characteristics of the high temperature cuprate superconductors (excepting two different saddle points located at ($\pm\pi$, 0) and (0, $\pm\pi$)) and suggest that the pseudogap formation might been due to the unique interior of the underdoped cuprate.