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Phys. Rev. Lett. 99, 157002 (2007) [4 pages]

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

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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

Received 2 April 2007; published 11 October 2007

We have performed a systematic angle-resolved photoemission study of as-grown and oxygen-reduced Pr2-xCexCuO4 and Pr1-xLaCexCuO4 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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.157002
DOI:
10.1103/PhysRevLett.99.157002
PACS:
74.72.Jt, 74.25.Jb, 74.62.Dh, 79.60.−i

*richarpi@bc.edu

 
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