Effect of lifshitz quantum phase transitions on the normal and superconducting states in cuprates

Тип публикации: статья из журнала

Год издания: 2010

Аннотация: We study the doping evolution of the electronic structure in the normal phase of high-Tc cuprates. The electronic structure and the Fermi surface of cuprates with a 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's 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 ?(C/T) ~ (x - xc)1/2 is similar to the Loram and Cooper experimental data in the vicinity of xc1 ? 0.15. In the superconducting state of cuprates, we consider both magnetic and phonon contributions to the d-wave pairing and found that there is no dominant mechanism of superconductivity. Magnetic and phonon contributions to the critical temperature are of the same order. © 2010.

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Журнал: Ukrainian Journal of Physics

Выпуск журнала: Vol. 55, Is. 1

Номера страниц: 55-64


  • Ovchinnikov S.G. (Siberian Federal University)
  • Korshunov M.M. (Department of Physics,University of Florida)
  • Shneyder E.I. (Reshetnev Siberian State Aerospace University)

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