Slow quantum oscillations without fine-grained Fermi Surface Reconstruction in Cuprate Superconductors

TL;DR

This paper suggests that slow quantum oscillations in cuprate superconductors originate from interlayer electron hopping, not Fermi surface reconstruction, providing a new interpretation of magnetic quantum oscillation data.

Contribution

It introduces a novel explanation for MQO in cuprates, attributing the oscillations to bilayer and inter-bilayer hopping instead of Fermi surface pockets reconstruction.

Findings

MQO frequencies relate to interlayer hopping parameters.

The pattern of peaks is doping-independent.

Estimated inter-layer transfer integrals and Fermi momentum.

Abstract

The Fourier transform of the observed magnetic quantum oscillations (MQO) in YBa$_{2}$Cu$_{3}$O$_{6+\delta }$ high-temperature superconductors has a prominent low-frequency peak with two smaller neighbouring peaks. The separation and positions of these three peaks are almost independent of doping. This pattern has been explained previously by rather special, exquisitely detailed, Fermi-surface reconstruction. We propose that these MQO have a different origin, and their frequencies are related to the bilayer and inter-bilayer electron hopping rather than directly to the areas of tiny Fermi-surface pockets. Such so-called "slow oscillations" explain more naturally many features of the observed oscillations and allow us to estimate the inter-layer transfer integrals and in-plane Fermi momentum.