Life of the nodal quasiparticles in Bi-2212 as seen by ARPES

TL;DR

This paper reviews ARPES studies on Bi-2212, revealing well-defined nodal quasiparticles in the pseudogap state and suggesting a magnetic origin for their scattering processes.

Contribution

It provides new insights into the nature of nodal quasiparticles and their scattering mechanisms in cuprate superconductors, emphasizing a magnetic origin.

Findings

Existence of well-defined quasiparticles in the pseudogap state

Quasiparticle scattering rate suggests a magnetic origin

Nodal direction behavior complements antinodal doping dependence

Abstract

While the pronounced doping dependence of the quasiparticle spectral weight in the antinodal region of the superconducting cuprates, as seen by ARPES, unambiguously points to the magnetic origin of the strong electron-boson coupling there, the nature of the electron scattering in the nodal direction remained unclear. Here we present a short review of our recent detailed investigations of the nodal direction of Bi-2212. Our findings prove the existence of well defined quasiparticles even in the pseudogap state and show that the essential part of the quasiparticle scattering rate, which appears on top of Auger-like electron-electron interaction, also implies a magnetic origin.