paper

Comment on "Measurement of x-ray absorption spectra of overdoped high-temperature cuprate superconductors: Inapplicability of the single-band Hubbard model"

arXiv:1003.3412

Abstract

In a recent Letter, Peets, et al. measured the x-ray intensity at the oxygen K-edge in overdoped La $_{2 - x}$ Sr $_{x}$ CuO $_{4 \pm I^´}$ (LSCO) and Tl $_{2}$ Ba $_{2}$ CuO $_{6 + I^´}$ . They claimed that, unlike the underdoped samples of LSCO and YBa $_{2}$ Cu $_{3}$ O $_{x}$ in which the integrated intensity increases at least linearly with doping, it saturates abruptly for a hole count exceeding $x \approx 0.23$ . They interpreted the saturation as a breakdown of the 1-band Hubbard model in the cuprates. However, we show that their results are in quantitative agreement with the 1-band Hubbard model.