Angle resolved photoemission from Nd1.85Ce0.15CuO4 using high energy photons: a fermi surface investigation.
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.
Claesson
T
T
Laboratory of Materials and Semiconductor Physics, Royal Institute of Technology, Electrum 229, S-164 40 Kista, Sweden. tcl@kth.se
Månsson
M
M
Dallera
C
C
Venturini
F
F
De Nadaï
C
C
Brookes
N B
NB
Tjernberg
O
O