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-Syro (1) , Masaki Ikeda , Teppei Yoshida , Atsushi Fujimori , Kyoko Ishizaka , Mario Okawa , Shik Shin , Richard L. Greene , Nicole Bontemps (2)

1 CSNSM PS2
2 LPEM - Laboratoire de Physique et d'Etude des Matériaux (UMR 8213)

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.

Domaines: Supraconductivité [cond-mat.supr-con]; Science des matériaux [cond-mat.mtrl-sci]; Electrons fortement corrélés [cond-mat.str-el]

A. F. Santander-Syro, Masaki Ikeda, Teppei Yoshida, Atsushi Fujimori, Kyoko Ishizaka, et al.. 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. Physical Review Letters, 2011, 106, pp.197002. ⟨10.1103/PhysRevLett.106.197002⟩. ⟨in2p3-00597384⟩