Evidence for suppressed metallicity on the surface of La2-xSrxCuO4 and Nd2-xCexCuO4

Details Evidence for suppressed metallicity on the surface of La2-xSrxCuO4 and Nd2-xCexCuO4 Evidence for suppressed metallicity on the surface of La2-xSrxCuO4 and Nd2-xCexCuO4

2005-01-26

arxiv.org/abs/cond-mat/0501621v1

Physical Review Letters Vol.95, 177002 (2005)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

Hard X-ray Photoemission spectroscopy (PES) of copper core electronic states, with a probing depth of $\sim$60 \AA, is used to show that the Zhang-Rice singlet feature is present in La$_2$CuO$_4$ but is absent in Nd$_2$CuO$_4$. Hole- and electron doping in La$_{2-x}$Sr$_x$CuO$_4$ (LSCO) and Nd$_{2-x}$Ce$_x$CuO$_4$ (NCCO) result in new well-screened features which are missing in soft X-ray PES. Impurity Anderson model calculations establish metallic screening as its origin, which is strongly suppressed within 15 $\text{\AA}$ of the surface. Complemented with X-ray absorption spectroscopy, the small chemical-potential shift in core levels ($\sim0.2$ eV) are shown to be consistent with modifications of valence and conduction band states spanning the band gap ($\sim1$ eV) upon hole- and electron-doping in LSCO and NCCO.

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