Superconducting Gap Anisotropy in Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_4$: Results from Photoemission

Abstract

We have performed angle resolved photoelectron spectroscopy on the electron doped cuprate superconductor Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_4$. 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.

5 pages, 4 figures, RevTex, to be published in Phys. Rev. Lett

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