title: Angle resolved photoemission from Nd1.85Ce0.15CuO4 using high energy photons: a fermi surface investigation.
abstract: We have performed an angle resolved photoemission study on a single crystal of the optimally electron doped (n-type) cuprate superconductor Nd2-xCexCuO4 (x=0.15) at a photon energy of 400 eV. The Fermi surface is mapped out and is, in agreement with earlier measurements, of hole-type with the expected Luttinger volume. However, comparing with previous low energy measurements, we observe a different Fermi surface shape and a different distribution of spectral intensity around the Fermi surface contour. The observed Fermi surface shape indicates a stronger electron correlation in the bulk as compared to the surface.
authors.affiliation: Laboratory of Materials and Semiconductor Physics, Royal Institute of Technology, Electrum 229, S-164 40 Kista, Sweden. tcl@kth.se
authors.forename: T
authors.initials: T
authors.lastname: Claesson
authors.forename: M
authors.initials: M
authors.lastname: Månsson
authors.forename: C
authors.initials: C
authors.lastname: Dallera
authors.forename: F
authors.initials: F
authors.lastname: Venturini
authors.forename: C
authors.initials: C
authors.lastname: De Nadaï
authors.forename: N B
authors.initials: NB
authors.lastname: Brookes
authors.forename: O
authors.initials: O
authors.lastname: Tjernberg