title: Evolution of the Fermi surface of the electron-doped high-temperature superconductor Nd(2-x)Ce(x)CuO(4) revealed by Shubnikov-de Haas oscillations.
abstract: We report on the direct probing of the Fermi surface in the bulk of the electron-doped superconductor Nd(2-x)Ce(x)CuO(4) 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 (pi/a, pi/a) ordering, known to exist at low doping levels, survives up to the overdoped superconducting regime.
authors.affiliation: Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Helm
authors.forename: M V
authors.initials: MV
authors.lastname: Kartsovnik
authors.forename: M
authors.initials: M
authors.lastname: Bartkowiak
authors.forename: N
authors.initials: N
authors.lastname: Bittner
authors.forename: M
authors.initials: M
authors.lastname: Lambacher
authors.forename: A
authors.initials: A
authors.lastname: Erb
authors.forename: J
authors.initials: J
authors.lastname: Wosnitza
authors.forename: R
authors.initials: R
authors.lastname: Gross