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Isotope effect in the model of strongly correlated electrons with the magnetic and phonon superconducting pairing mechanisms

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Abstract

Peculiarities of the temperature isotope effect in a BCS-type theory describing the exchange and phonon mechanisms of Cooper pairing in a system of strongly correlated electrons are considered. The electron-phonon interaction constant is determined from the fitting of the calculated value of the isotope-effect index to the observed value with the parameters of La2 − x Sr x CuO4 obtained from ab initio calculations. The value of this constant indicates that the contribution from the traditional pairing mechanism to the superconducting state is of the same order of magnitude as the contribution from the magnetic mechanism.

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Authors and Affiliations

  1. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russia

    E. I. Shneyder & S. G. Ovchinnikov

  2. Siberian State Aerospace University, Krasnoyarsk, 660014, Russia

    E. I. Shneyder

  3. Siberian Federal University, Krasnoyarsk, 660041, Russia

    S. G. Ovchinnikov

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  1. E. I. Shneyder
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  2. S. G. Ovchinnikov
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Correspondence to E. I. Shneyder.

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Original Russian Text © E.I. Shneyder, S.G. Ovchinnikov, 2009, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2009, Vol. 136, No. 6, pp. 1177–1182.

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Shneyder, E.I., Ovchinnikov, S.G. Isotope effect in the model of strongly correlated electrons with the magnetic and phonon superconducting pairing mechanisms. J. Exp. Theor. Phys. 109, 1017–1021 (2009). https://doi.org/10.1134/S1063776109120139

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