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We have analyzed experimental evidence for an anomalous transfer of spectralweight from high to low energy scales in both electron and hole doped cupratesas a function of doping. X-ray scattering, optical and photoemission spectraare all found to show that the high energy spectral weight decreases withincreasing doping at a rate much faster than predictions of the large $U-$limitcalculations. The observed doping evolution is however well-described by anintermediate coupling scenario where the effective Hubbard $U$ is comparable tothe bandwidth. The experimental spectra across various spectroscopies areinconsistent with fixed-$U$ exact diagonalization or quantum Monte Carlocalculations, and suggest a significant doping dependence of the effective $U$in the cuprates.

Failure of t-J models in describing doping evolution of spectral weight in x-ray scattering, optical and photoemission spectra of the cuprates