We analyzed photoemssion data for several doping levels of the Bi_2Sr_2CaCu_2O_{8+x} compounds, ranging from overdoped to underdoped. We show that the high frequency part of the spectra near (0,\pi) can be described by Fermi liquid theory in the overdoped regime, but exhibits a non-Fermi liquid behavior in the underdoped regime. We further demonstrate that this novel behavior fits reasonably well to a 1/\sqrt{\omega} behavior suggested for systems with strong spin fluctuations.
@article{arxiv.cond-mat/9805297,
title = {Evolution of the quasiparticle spectral function in cuprates},
author = {S. Misra and R. Gatt and T. Schmauder and Andrey V. Chubukov and M. Onellion and M. Zacchigna and I. Vobornik and F. Zwick and M. Grioni and G. Margaritondo and C. Quitmann and C. Kendziora},
journal= {arXiv preprint arXiv:cond-mat/9805297},
year = {2009}
}
Comments
5 pages, 2 figures (EPS), RevTeX, submitted to Phys Rev B RC