Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-09-12
JETP 109, 775 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 4 figures
Scientific paper
10.1134/S1063776109110077
We study the doping evolution of the electronic structure in the normal phase of high-$T_c$ cuprates. Electronic structure and Fermi surface of cuprates with single CuO$_2$ layer in the unit cell like La$_{2-x}$Sr$_x$CuO$_4$ 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, $x_{c1}$ and $x_{c2}$, 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 $\delta(C/T) \sim (x - x_c)^{1/2}$ is similar to the Loram and Cooper experimental data in the vicinity of $x_{c1} \approx 0.15$.
Korshunov Maxim M.
Ovchinnikov Sergei G.
Shneyder E. I.
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