We have made a high-resolution photoemission study of La2-xSrxCuO4 in a wide hole concentration (x) range from a heavily overdoped metal to an undoped insulator. As x decreases, the spectral density of states at the chemical potential (\mu) is suppressed with an x-dependence similar to the suppression of the electronic specific heat coefficient. In the underdoped region, the spectra show a pseudogap structure on the energy scale of 0.1 eV. The width of the pseudogap increases with decreasing x following the x-dependence of the characteristic temperatures of the magnetic susceptibility and the Hall coefficient.
@article{arxiv.cond-mat/9806341,
title = {Doping Dependent Density of States and Pseudogap Behavior in La2-xSrxCuO4},
author = {A. Ino and T. Mizokawa and K. Kobayashi and A. Fujimori and T. Sasagawa and T. Kimura and K. Kishio and K. Tamasaku and H. Eisaki and S. Uchida},
journal= {arXiv preprint arXiv:cond-mat/9806341},
year = {2009}
}
Comments
4 pages, 3 EPS figures, uses RevTex; few references have been updated