We report on the direct probing of the Fermi surface in the bulk of the electron-doped superconductor Nd2−xCexCuO4 at different doping levels by means of magnetoresistance quantum oscillations. Our data reveal a sharp qualitative change in the Fermi surface topology, due to translational symmetry breaking in the electronic system which occurs at a critical doping level significantly exceeding the optimal doping. This result implies that the (π/a,π/a) ordering, known to exist at low doping levels, survives up to the overdoped superconducting regime.
@article{arxiv.0906.1431,
title = {Fermi Surface Evolution in an Electron-Doped High-Tc Superconductor Revealed by Magnetic Quantum Oscillations},
author = {T. Helm and M. V. Kartsovnik and M. Bartkowiak and N. Bittner and M. Lambacher and A. Erb and J. Wosnitza and R. Gross},
journal= {arXiv preprint arXiv:0906.1431},
year = {2009}
}