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- W1663048480 abstract "Strong electron correlations are responsible both for the insulator ground state of undoped La$_2$CuO$_4$ and strong antiferromagnetic coupling $J$ between neighbouring spins. We consider magnetic mechanism of superconducting pairing in the effective low energy $t - t' - t - J^*$ model with all parameters calculated {it ab initio}. Interaction of strongly correlated electrons with different phonon modes is also incorporated. In a BCS type theory the $d_{x^2 - y^2}$ gap is given by a sum of magnetic and phonon contributions. The phonon coupling parameter $lambda = f(x)G$, where $G$ is a combination of bare electron-phonon couplings for all modes and the function $f$ depends on the hole concentration $x$ due to strong electron correlations. The main contribution to the only fitting parameter $G$ is determined by a competition of the breathing and buckling modes. Fitting the parameter $G$ from the isotope effect we obtain that magnetic and phonon contributions to the critical temperature $T_c $ work together and are of the same order of magnitude." @default.
- W1663048480 created "2016-06-24" @default.
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- W1663048480 date "2008-09-21" @default.
- W1663048480 modified "2023-09-27" @default.
- W1663048480 title "Magnetic and phonon mechanisms of superconductivity in La$_{2-x}$Sr$_x$CuO$_4$ support each other" @default.
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- W1663048480 hasPublicationYear "2008" @default.
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