We analyze doping dependent spectral intensities and Fermi surface maps obtained recently in Nd2−xCexCuO4±δ (NCCO) via high resolution ARPES measurements, and show that the behavior of this electron-doped compound can be understood as the closing of a Mott (pseudo) gap, leading to a quantum critical point just above optimal doping. The doping dependence of the effective Hubbard U adduced by comparing theoretical and experimental spectra is in resonable accord with various estimates and a simple screening calculation.
@article{arxiv.cond-mat/0201117,
title = {Quantum Critical Point in Electron-Doped Cuprates},
author = {C. Kusko and R. S. Markiewicz and M. Lindroos and A. Bansil},
journal= {arXiv preprint arXiv:cond-mat/0201117},
year = {2007}
}