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Doping evolution of Zhang-Rice singlet spectral weight: a comprehensive examination by x-ray absorption spectroscopy

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arxiv 1308.0865 v1 pith:SJKJVXMJ submitted 2013-08-05 cond-mat.supr-con cond-mat.str-el

Doping evolution of Zhang-Rice singlet spectral weight: a comprehensive examination by x-ray absorption spectroscopy

Y.-J. Chen , M. G. Jiang , C. W. Luo , J.-Y. Lin , K. H. Wu , J. M. Lee , J. M. Chen , Y. K. Kuo
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J. Y. Juang Chung-Yu Mou
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classification cond-mat.supr-con cond-mat.str-el
keywords textitdopingabsorptionregimessingletspectralspectroscopyweight
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The total spectral weight \textit{S} of the emergent low-energy quasipaticles in high-temperature superconductors is explored by x-ray absorption spectroscopy. In order to examine the applicability of the Hubbard model, regimes that cover from zero doping to overdoping are investigated. In contrast to mean field theory, we found that \textit{S} deviates from linear dependence on the doping level \textit{p}. The slope of \textit{S} versus \textit{p} changes continuously throughout the whole doping range with no sign of saturation up to \textit{p} = 0.23. Therefore, the picture of Zhang-Rice singlet remains intact within the most prominent doping regimes of HTSC's.

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