We study the doping evolution of the electronic structure in the normal phase of high-Tc cuprates. Electronic structure and Fermi surface of cuprates with single CuO2 layer in the unit cell like La2−xSrxCuO4 have been calculated by the LDA+GTB method in the regime of strong electron correlations (SEC) and compared to ARPES and quantum oscillations data. We have found two critical concentrations, xc1 and xc2, where the Fermi surface topology changes. Following I.M. Lifshitz ideas of the quantum phase transitions (QPT) of the 2.5-order we discuss the concentration dependence of the low temperature thermodynamics. The behavior of the electronic specific heat δ(C/T)∼(x−xc)1/2 is similar to the Loram and Cooper experimental data in the vicinity of xc1≈0.15.
@article{arxiv.0909.2308,
title = {Lifshitz quantum phase transitions and Fermi surface transformation with hole doping in high-$T_c$ superconductors},
author = {S. G. Ovchinnikov and M. M. Korshunov and E. I. Shneyder},
journal= {arXiv preprint arXiv:0909.2308},
year = {2011}
}