Robustness of the Van Hove scenario for high-T(c) superconductors.
The pinning of the Fermi level to the Van Hove singularity and the formation of flat bands in the two-dimensional t-t' Hubbard model is investigated by the renormalization group technique. The "Van Hove" scenario of non-Fermi-liquid behavior for high-T(c) compounds can take place in a broad enough range of the hole concentrations. The results are in qualitative agreement with the recent angle-resolved photoemission spectroscopy data on La 2CuO (4).
Institute of Metal Physics, 620219, Ekaterinburg, Russia.
V Yu
VY
Irkhin
A A
AA
Katanin
M I
MI
Katsnelson