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

Abstract

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.

4 pages, 3 figures, accepted to Phys. Rev. Lett

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• $d$-wave superconducting gap observed in protect-annealed electron-doped cuprate superconductors Pr${}_{1.3-x}$La${}_{0.7}$Ce${}_x$CuO${}_4$
• Experimental evidence for Zeeman spin-orbit coupling in layered antiferromagnetic conductors
• Doping dependence of charge order in electron-doped cuprate superconductors
• Anisotropic dressing of electrons in electron-doped cuprate superconductors
• Magnetotransport evidence of irreversible spin reorientation in the collinear antiferromagnetic state of underdoped ${\mathrm{Nd}}_{2-x}{\mathrm{Ce}}_x{\mathrm{CuO}}_4$
• ARPES autocorrelation in electron-doped cuprate superconductors