Anomalous electronic structure and pseudogap effects in Nd1.85Ce0.15CuO4

Phys Rev Lett. 2001 Oct 1;87(14):147003. doi: 10.1103/PhysRevLett.87.147003. Epub 2001 Sep 18.

Abstract

We report a high-resolution angle-resolved photoemission spectroscopic study of the electron-doped ( n-type) cuprate superconductor Nd1.85Ce0.15CuO4. We observe regions along the Fermi surface where the near- E(F) intensity is suppressed and the spectral features are broad in a manner reminiscent of the high-energy "pseudogap" in the underdoped p-type (hole doped) cuprates. However, instead of occurring near the (pi,0) region, as in the p-type materials, this pseudogap falls near the intersection of the underlying Fermi surface with the antiferromagnetic Brillouin zone boundary.