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Physical Review Letters 106 (2011) 197002
Two-Fermi-surface superconducting state and a nodal d-wave gap in the electron-doped Sm(1.85)Ce(0.15)CuO(4-d) cuprate superconductor
A. F. Santander-Syro1, 2, Masaki Ikeda, Teppei Yoshida, Atsushi Fujimori, Kyoko Ishizaka, Mario Okawa, Shik Shin, Richard L. Greene, Nicole Bontemps2

We report on laser-excited angle-resolved photoemission spectroscopy (ARPES) in the electron-doped cuprate Sm(1.85)Ce(0.15)CuO(4-d). The data show the existence of a nodal hole-pocket Fermi-surface both in the normal and superconducting states. We prove that its origin is long-range antiferromagnetism by an analysis of the coherence factors in the main and folded bands. This coexistence of long-range antiferromagnetism and superconductivity implies that electron-doped cuprates are two-Fermi-surface superconductors. The measured superconducting gap in the nodal hole-pocket is compatible with a d-wave symmetry.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 :  LPEM - Laboratoire de Physique et d'Etude des Matériaux
Physique/Matière Condensée/Supraconductivité

Physique/Matière Condensée/Science des matériaux

Physique/Matière Condensée/Electrons fortement corrélés
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