Renormalization Group Approach to the Normal State of Copper-Oxide Superconductors

Дата и время публикации : 1996-02-06T19:42:06Z

Авторы публикации и институты :
J. Gonzalez
F. Guinea
M. A. H. Vozmediano

Ссылка на журнал-издание: Nucl.Phys. B485 (1997) 694-726
Коментарии к cтатье: Latex manuscript, 29 pages, 4 postcript figures
Первичная категория: cond-mat

Все категории : cond-mat, hep-th

Краткий обзор статьи: We study by means of renormalization group techniques the effect that on the two-dimensional electron liquid may have the van Hove singularities observed experimentally in the copper-oxide superconductors. We find significant deviations from Fermi liquid behavior, that lead to the appearance of an unstable fixed point in the renormalization group flow of the effective coupling constant. Besides the attenuation of electron quasiparticles already known on phenomenological grounds, our approach is able to explain the reduction in the dispersion of the band as well as the pinning of the Fermi level near the singularity, as observed in the photoemission experiments.

Category: Physics