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.
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.
Helm
T
T
Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany.
Kartsovnik
M V
MV
Bartkowiak
M
M
Bittner
N
N
Lambacher
M
M
Erb
A
A
Wosnitza
J
J
Gross
R
R