Magnetic Breakdown in the electron-doped cuprate superconductor Nd$_{2-x}$Ce$_x$CuO$_4$: the reconstructed Fermi surface survives in the strongly overdoped regime

TL;DR

This study demonstrates that a reconstructed Fermi surface persists in electron-doped cuprate superconductor Nd$_{2-x}$Ce$_x$CuO$_4$ even in the strongly overdoped regime, indicating a link between Fermi surface topology and superconductivity.

Contribution

It provides experimental evidence of magnetic breakdown and the survival of a reconstructed Fermi surface at high doping levels in electron-doped cuprates.

Findings

Reconstructed Fermi surface persists in overdoped regime.

Magnetic breakdown observed at high magnetic fields.

Fermi surface topology linked to superconducting pairing.

Abstract

We report on semiclassical angle-dependent magnetoresistance oscillations (AMRO) and the Shubnikov-de Haas effect in the electron-overdoped cuprate superconductor Nd$_{2-x}$Ce$_x$CuO$_4$. Our data provide convincing evidence for magnetic breakdown in the system. This shows that a reconstructed multiply-connected Fermi surface persists, at least at strong magnetic fields, up to the highest doping level of the superconducting regime. Our results suggest an intimate relation between translational symmetry breaking and the superconducting pairing in the electron-doped cuprate superconductors.