Abstract
In order to clarify the intrinsic bulk electronic structure of La
1−xSr
xMnO
3 (LSMO) thin films, we have performed high-energy (
h
ν
=
5.95
keV) synchrotron photoemission spectroscopy (PES) of Mn 2p core-levels. In sharp contrast with the previous soft X-ray PES (
h
ν
=
800
–1486.6 eV), the high-energy PES spectra exhibit a clear additional peak at the low binding-energy side of the Mn 2
p
3
/
2
peak. To check for surface sensitivity, we measured take-off-angle dependence of Mn 2p core-levels. The results indicate that this additional peak originates from the bulk electronic structure. The peak shows a noticeable increase in the metallic phase of LSMO for
x
=
0.2
and 0.4, indicating that the origin of this peak is strongly related to the metallic physical properties of LSMO thin films. A single ion (
MO
6
) cluster calculation including charge transfer from doping-induced states reproduces the new bulk-derived feature observed in Mn 2p core-levels.