Two-component electron fluid in underdoped high-$T_c$ cuprate superconductors

TL;DR

This paper presents evidence for a two-component electron fluid in underdoped high-$T_c$ cuprate superconductors, linking NMR and entropy data to the YRZ model's reconstructed energy-momentum dispersion.

Contribution

It demonstrates that the two-component scenario arises from the YRZ model's reconstructed dispersion, explaining experimental observations in underdoped cuprates.

Findings

Spin susceptibility calculations match experimental data

Doping and temperature dependence are accurately reproduced

Two-component behavior is linked to the pseudogap regime

Abstract

Evidence from NMR of a two-component spin system in cuprate high-$T_c$ superconductors is shown to be paralleled by similar evidence from the electronic entropy so that a two-component quasiparticle fluid is implicated. We propose that this two-component scenario is restricted to the optimal and underdoped regimes and arises from the upper and lower branches of the reconstructed energy-momentum dispersion proposed by Yang, Rice and Zhang (YRZ) to describe the pseudogap. We calculate the spin susceptibility within the YRZ formalism and show that the doping and temperature dependence reproduces the experimental data for the cuprates.