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APS » Journals » Phys. Rev. Lett. » Volume 103 » Issue 15
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Phys. Rev. Lett. 103, 157002 (2009) [4 pages]

Evolution of the Fermi Surface of the Electron-Doped High-Temperature Superconductor Nd2-xCexCuO4 Revealed by Shubnikov–de Haas Oscillations

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T. Helm1, M. V. Kartsovnik1, M. Bartkowiak2, N. Bittner1, M. Lambacher1, A. Erb1, J. Wosnitza2, and R. Gross1,3
1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany
2Hochfeld-Magnetlabor Dresden, Forschungszentrum Dresden-Rossendorf, D-01328 Dresden, Germany
3Physik-Department, Technische Universität München, D-85748 Garching, Germany

Received 19 May 2009; published 5 October 2009

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.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.157002
DOI:
10.1103/PhysRevLett.103.157002
PACS:
74.25.Jb, 71.18.+y, 74.20.Mn, 74.72.Jt
 
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