Physics – Condensed Matter – Superconductivity
Scientific paper
2009-05-08
Phys. Rev. Lett. 103, 087402 (2009)
Physics
Condensed Matter
Superconductivity
4 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.103.087402
X-ray absorption spectra on the overdoped high-temperature superconductors Tl_2Ba_2CuO_{6+delta} (Tl-2201) and La_{2-x}Sr_xCuO_{4+delta} (LSCO) 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 p ~ 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.
Ando Yoichi
Bonn Douglas A.
Ellis Stephen D.
Hardy Walter N.
Hawthorn D. G.
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