Evidence for suppressed screening on the surface of high temperature La2-xSrxCuO4 and Nd2-xCexCuO4 superconductors

M. Taguchi, A. Chainani, K. Horiba, Y. Takata, M. Yabashi, K. Tamasaku, Y. Nishino, D. Miwa, T. Ishikawa, T. Takeuchi, K. Yamamoto, M. Matsunami, S. Shin, T. Yokoya, E. Ikenaga, K. Kobayashi, T. Mochiku, K. Hirata, J. Hori, K. IshiiF. Nakamura, T. Suzuki

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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.

Original languageEnglish
Article number177002
JournalPhysical Review Letters
Volume95
Issue number17
DOIs
Publication statusPublished - Oct 21 2005
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Taguchi, M., Chainani, A., Horiba, K., Takata, Y., Yabashi, M., Tamasaku, K., Nishino, Y., Miwa, D., Ishikawa, T., Takeuchi, T., Yamamoto, K., Matsunami, M., Shin, S., Yokoya, T., Ikenaga, E., Kobayashi, K., Mochiku, T., Hirata, K., Hori, J., ... Suzuki, T. (2005). Evidence for suppressed screening on the surface of high temperature La2-xSrxCuO4 and Nd2-xCexCuO4 superconductors. Physical Review Letters, 95(17), [177002]. https://doi.org/10.1103/PhysRevLett.95.177002