title: Two-Fermi-surface superconducting state and a nodal d-wave energy gap of the electron-doped Sm1.85Ce0.15CuO(4-δ) cuprate superconductor.
abstract: We report on laser-excited angle-resolved photoemission spectroscopy in the electron-doped cuprate Sm1.85Ce0.15CuO(4-δ). 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 antiferrmagnetism 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.
authors.affiliation: CSNSM, Université Paris-Sud and CNRS/IN2P3, 91405 Orsay cedex, France.
authors.forename: A F
authors.initials: AF
authors.lastname: Santander-Syro
authors.forename: M
authors.initials: M
authors.lastname: Ikeda
authors.forename: T
authors.initials: T
authors.lastname: Yoshida
authors.forename: A
authors.initials: A
authors.lastname: Fujimori
authors.forename: K
authors.initials: K
authors.lastname: Ishizaka
authors.forename: M
authors.initials: M
authors.lastname: Okawa
authors.forename: S
authors.initials: S
authors.lastname: Shin
authors.forename: B
authors.initials: B
authors.lastname: Liang
authors.forename: A
authors.initials: A
authors.lastname: Zimmers
authors.forename: R L
authors.initials: RL
authors.lastname: Greene
authors.forename: N
authors.initials: N
authors.lastname: Bontemps