Abstract
We have performed in situ angle-resolved photoemission spectroscopy
on the electron doped cuprate superconductor La2-xCexCuO4 (x=0.1)
using high-quality films grown by molecular beam epitaxy. The obtained
photoemission spectra were free from "dirt" peaks. In addition, the
time evolution of the spectra due to impurity adsorption is rather
gradual, and the sample surface is stable even at ambient temperature,
which is in contrast with previous reports on bulk Nd2-xCexCuO4 (NCCO)
single crystals. The energy distribution curves show clear dispersions
near the Fermi energy (EF) with some EF crossings. The resultant
Fermi surface is hole-like and centered around (pi,pi), which
essentially agrees with that predicted for NCCO by band calculations
and also with the experimentally determined Fermi surface of optimally
doped NCCO (x=0.15).
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