Competition between Antiferromagnetism and Superconductivity in the Electron-Doped Cuprates Triggered by Oxygen Reduction

P. Richard, M. Neupane, Y.-M. Xu, P. Fournier, S. Li, Pengcheng Dai, Z. Wang, and H. Ding
Phys. Rev. Lett. 99, 157002 – Published 11 October 2007

Abstract

We have performed a systematic angle-resolved photoemission study of as-grown and oxygen-reduced Pr2xCexCuO4 and Pr1xLaCexCuO4 electron-doped cuprates. In contrast with the common belief, neither the band filling nor the band parameters are significantly affected by the oxygen reduction process. Instead, we show that the main electronic role of the reduction process is to remove an anisotropic leading edge gap around the Fermi surface. While the nodal leading edge gap is induced by long-range antiferomagnetic order, the origin of the antinodal one remains unclear.

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  • Received 2 April 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.157002

©2007 American Physical Society

Authors & Affiliations

P. Richard1,*, M. Neupane1, Y.-M. Xu1, P. Fournier2, S. Li3, Pengcheng Dai3,4, Z. Wang1, and H. Ding1

  • 1Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
  • 2Département de physique, Université de Sherbrooke, Sherbrooke, Québec, Canada, J1K 2R1
  • 3Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
  • 4Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • *richarpi@bc.edu

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Vol. 99, Iss. 15 — 12 October 2007

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