2006/10/20 by M. M. Korshunov, С. Г. Овчинников, S. G. Ovchinnikov · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1140/epjb/e2007-00179-2
published as Eur. Phys. J. B 57, 271-278 (2007) · 8 pages
arxiv created 2006/10/20 · openalex publication_date 2007/06/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper a mean-field theory for the spin-liquid paramagnetic non-superconducting phase of the p- and n-type High-Tc cuprates is developed. This theory applied to the effective t-t'-t''-J^* model with the \it ab initio calculated parameters and with the three-site correlated hoppings. The static spin-spin and kinematic correlation functions beyond Hubbard-I approximation are calculated self-consistently. The evolution of the Fermi surface and band dispersion is obtained for the wide range of doping concentrations x. For p-type systems the three different types of behavior are found and the transitions between these types are accompanied by the changes in the Fermi surface topology. Thus a quantum phase transitions take place at x=0.15 and at x=0.23. Due to the different Fermi surface topology we found for n-type cuprates only one quantum critical concentration, x=0.2. The calculated doping dependence of the nodal Fermi velocity and the effective mass are in good agreement with the experimental data.