Doping-dependent evolution of low-energy excitations and quantum phase transitions within an effective model for high-T c copper oxides

M. M. Korshunov () and S. G. Ovchinnikov

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 57, issue 3, 271-278

Abstract: In this paper a mean-field theory for the spin-liquid paramagnetic non-superconducting phase of the p- and n-type high-T c cuprates is developed. This theory applied to the effective t-t'-t′′-J * model with the 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. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 74.72.-h Cuprate superconductors (high-Tc and insulating parent compounds), 74.25.Jb Electronic structure, 73.43.Nq Quantum phase transitions, 71.18.+y Fermi surface: calculations and measurements; effective mass, g factor, (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00179-2

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