Evidence for Suppressed Screening on the Surface of High Temperature La2-xSrxCuO4 and Nd2-xCexCuO4 Superconductors
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概要
- 論文の詳細を見る
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.
- American Physical Societyの論文
- 2005-10-19
著者
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YABASHI Makina
SPring-8/Riken
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Tamasaku K
Department Of Physics And Department Of Complexity Science And Engineering University Of Tokyo
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KOBAYASHI Keisuke
Japan Synchrotron Radiation Research Institute/SPring-8
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NISHlNO Yoshinori
Spring-8
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Ishikawa Tetsuya
Riken Spring-8 Center Harima Institute
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Tabata Y
Riken Spring-8 Center Harima Institute
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