Quantum oscillations from the reconstructed Fermi surface in electron-doped cuprate superconductors

TL;DR

This study reveals that electron-doped cuprate superconductors exhibit quantum oscillations indicating a reconstructed small Fermi surface, with behaviors linked to spin fluctuations and electronic reconstruction across different doping levels.

Contribution

It provides direct experimental evidence of Fermi surface reconstruction in electron-doped cuprates through high-field quantum oscillation measurements, highlighting a universal feature.

Findings

Presence of small Fermi surface in optimally doped cuprates

Correlation between negative magnetoresistance and scattering changes

Evidence of spin fluctuation effects on quantum oscillations

Abstract

We have studied the electronic structure of electron-doped cuprate superconductors via measurements of high-field Shubnikov-de Haas oscillations in thin films. In optimally doped Pr$_{2-x}$Ce$_{x}$CuO$_{4\pm\delta}$ and La$_{2-x}$Ce$_{x}$CuO$_{4\pm\delta}$, quantum oscillations indicate the presence of a small Fermi surface, demonstrating that electronic reconstruction is a general feature of the electron-doped cuprates, despite the location of the superconducting dome at very different doping levels. Negative high-field magnetoresistance is correlated with an anomalous low-temperature change in scattering that modifies the amplitude of quantum oscillations. This behavior is consistent with effects attributed to spin fluctuations.