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ID 18788
file
creator
Taguchi, Munetaka
Chainani, Ashish
Horiba, Koji
Takata, Yasutaka
Yabashi, Makina
Tamasaku, Kenji
Nishino, Yoshinori
Miwa, Daigo
Ishikawa, Tetsuya
Takeuchi, Tomoyuki
Yamamoto, Kazuo
Matsunami, Masaharu
Shin, Shik
Yokoya, Takayoshi
Ikenaga, Eiji
Kobayashi, Keisuke
Mochiku, Takashi
Hirata, Kazuto
Hori, Junya
Ishii, Kiyotaka
Nakamura, Fumihiko
abstract
Hard x-ray photoemission spectroscopy (PES) of Cu core electronic states, with a probing depth of ∼60, is used to show that the Zhang-Rice singlet feature is present in La2CuO4 but is absent in Nd2CuO4. Hole and electron doping in La2-xSrxCuO4 (LSCO) and Nd2-xCexCuO4 (NCCO) result in new well-screened features which are missing in soft x-ray PES. Impurity Anderson model calculations establish screening from doped states as its origin, which is strongly suppressed within 15 of the surface. Complemented with x-ray absorption spectroscopy, the small chemical-potential shift in core levels (∼0.2eV) are shown to be consistent with modifications of valence and conduction band states spanning the band gap (∼1eV) upon hole and electron doping in LSCO and NCCO.
journal title
Physical Review Letters
volume
Volume 95
issue
Issue 17
start page
177002-1
end page
177002-4
date of issued
2005-10-19
publisher
American Physical Society
issn
0031-9007
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2005 American Physical Society.
relation url
department
Graduate School of Advanced Sciences of Matter



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