title: Superconducting gap anisotropy in Nd1.85Ce0.15CuO4: results from photoemission.
abstract: We have performed angle resolved photoelectron spectroscopy on the electron doped cuprate superconductor Nd1.85Ce0.15CuO4. A comparison of the leading edge midpoints between the superconducting and normal states reveals a small, but finite shift of 1.5-2 meV near the ( pi,0) position, but no observable shift along the zone diagonal near ( pi/2, pi/2). This is interpreted as evidence for an anisotropic superconducting gap in the electron doped materials, which is consistent with the presence of d-wave superconducting order in this cuprate superconductor.
authors.affiliation: Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA.
authors.forename: N P
authors.initials: NP
authors.lastname: Armitage
authors.forename: D H
authors.initials: DH
authors.lastname: Lu
authors.forename: D L
authors.initials: DL
authors.lastname: Feng
authors.forename: C
authors.initials: C
authors.lastname: Kim
authors.forename: A
authors.initials: A
authors.lastname: Damascelli
authors.forename: K M
authors.initials: KM
authors.lastname: Shen
authors.forename: F
authors.initials: F
authors.lastname: Ronning
authors.forename: Z X
authors.initials: ZX
authors.lastname: Shen
authors.forename: Y
authors.initials: Y
authors.lastname: Onose
authors.forename: Y
authors.initials: Y
authors.lastname: Taguchi
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura