Antiferromagnetism-superconductivity competition in electron-doped cuprates triggered by oxygen reduction

Details Antiferromagnetism-superconductivity competition in electron-doped cuprates triggered by oxygen reduction Antiferromagnetism-superconductivity competition in electron-doped cuprates triggered by oxygen reduction

2007-04-03

arxiv.org/abs/0704.0453v1

Physical Review Letters 99, 157002 (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.157002

We have performed a systematic angle-resolved photoemission study of as-grown and oxygen-reduced Pr$_{2-x}$Ce$_x$CuO$_4$ and Pr$_{1-x}$LaCe$_{x}$CuO$_4$ electron-doped cuprates. In contrast to 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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