Fermi Surface Evolution in an Electron-Doped High-Tc Superconductor Revealed by Magnetic Quantum Oscillations

  title={Fermi Surface Evolution in an Electron-Doped High-Tc Superconductor Revealed by Magnetic Quantum Oscillations},
  author={Toni Helm and Mark V. Kartsovnik and Marek Bartkowiak and Nikolaj Bittner and Michael Lambacher and Andreas Erb and Jochen Wosnitza and Rudolf Gross},
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… 

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