Interplay of pseudo- and superconducting gaps: observable manifestations in cuprates

TL;DR

This paper investigates the relationship between pseudogap and superconducting gap in cuprates, using a Hubbard model to interpret angular dependence, doping, and temperature effects observed in photoemission and tunneling spectra.

Contribution

It introduces a model linking pseudogap phenomena to electron removal in dielectric zones, explaining spectral features and asymmetries in cuprates.

Findings

Spectral functions show a sharp Fermi boundary at certain directions.

Tunneling spectra display only the superconducting gap with significant asymmetry.

Model suggests the need to consider bilayer structures to fully explain data.

Abstract

Angular dependence of gap, seen in photoemission, its evolution with doping and temperature are interpreted on base t-t'-U Hubbard model in which a pseudogap is a working function for electrons removing from dielectric segments of zone boundary. Tunnel spectra in one-particle approximation display only superconducting gap and too large asymmetry in regions aside from optimal doping. Spectral functions confirm sharp well defined Fermi boundary at $k_x=k_y$ direction and smoothed destructed one at the $\G(0,0)-M(\pi,0)-Y(\pi ,\pi)$ path. Both tunnel and ARPES data seem require spreading a model to bilayer ones.