Evidence for Suppressed Screening on the Surface of High Temperature La2-xSrxCuO4 and Nd2-xCexCuO4 Superconductors
Physical Review Letters Volume 95 Issue 17
Page 177002-1-177002-4
published_at 2005-10-19
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| File | |
| Title ( eng ) |
Evidence for Suppressed Screening on the Surface of High Temperature La2-xSrxCuO4 and Nd2-xCexCuO4 Superconductors
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| 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
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| Source Title |
Physical Review Letters
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| Volume | 95 |
| Issue | 17 |
| Start Page | 177002-1 |
| End Page | 177002-4 |
| 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.
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
American Physical Society
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| Date of Issued | 2005-10-19 |
| Rights |
Copyright (c) 2005 American Physical Society.
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[ISSN] 0031-9007
[DOI] 10.1103/PhysRevLett.95.177002
[NCID] AA00773679
[DOI] http://dx.doi.org/10.1103/PhysRevB.62.4142
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