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- W1505802971 abstract "X-ray absorption spectra on the overdoped high-temperature superconductors ${mathrm{Tl}}_{2}{mathrm{Ba}}_{2}{mathrm{CuO}}_{6+ensuremath{delta}}$ and ${mathrm{La}}_{2ensuremath{-}x}{mathrm{Sr}}_{x}{mathrm{CuO}}_{4ifmmodepmelsetextpmfi{}ensuremath{delta}}$ reveal a striking departure in the electronic structure from that of the underdoped regime. The upper Hubbard band, identified with strong correlation effects, is not observed on the oxygen $K$ edge, while the lowest-energy prepeak gains less intensity than expected above $pensuremath{sim}0.21$. This suggests a breakdown of the Zhang-Rice singlet approximation and a loss of correlation effects or a significant shift in the most fundamental parameters of the system, rendering single-band Hubbard models inapplicable. Such fundamental changes suggest that the overdoped regime may offer a distinct route to understanding in the cuprates." @default.
- W1505802971 created "2016-06-24" @default.
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- W1505802971 date "2009-08-19" @default.
- W1505802971 modified "2023-09-27" @default.
- W1505802971 title "X-Ray Absorption Spectra Reveal the Inapplicability of the Single-Band Hubbard Model to Overdoped Cuprate Superconductors" @default.
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- W1505802971 doi "https://doi.org/10.1103/physrevlett.103.087402" @default.
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