Superconducting gap anisotropy in Nd1.85Ce0.15CuO4: results from photoemission.
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.
Armitage
N P
NP
Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA.
Lu
D H
DH
Feng
D L
DL
Kim
C
C
Damascelli
A
A
Shen
K M
KM
Ronning
F
F
Shen
Z X
ZX
Onose
Y
Y
Taguchi
Y
Y
Tokura
Y
Y