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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 theexistence of a nodal hole-pocket Fermi-surface both in the normal andsuperconducting states. We prove that its origin is long-rangeantiferromagnetism by an analysis of the coherence factors in the main andfolded bands. This coexistence of long-range antiferromagnetism andsuperconductivity implies that electron-doped cuprates are two-Fermi-surfacesuperconductors. The measured superconducting gap in the nodal hole-pocket iscompatible with a d-wave symmetry.

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