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Quantum Phase Transitions and Superconductivity in Single- and Two-Layer Cuprates in the Multiband Theory of Hubbard Fermions

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Abstract

We consider the doping dependence of the normal and superconducting properties of La2Sr2−x CuO2 and YBa2Cu3O7 in the low energy effective model based on the ab initio LDA+GTB calculations. With doping we have found a concentration region with electronic instability of the uniform state. We have shown that two quantum phase transitions (QPT) of the Lifshitz type correspond well to the experimental phase diagram. For superconducting state we have considered both magnetic and phonon mechanisms of pairing.

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Acknowledgements

This work is supported by the grant NSh-1044.2012.2, Presidium RAS project 20.7, FCP GK P891, FCP GK 16.740.12.0731. Authors (MMK, EISh, IAM) gratefully acknowledges support from the nonprofit Dynasty foundation.

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Correspondence to S. G. Ovchinnikov.

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Ovchinnikov, S.G., Korshunov, M.M., Makarov, I.A. et al. Quantum Phase Transitions and Superconductivity in Single- and Two-Layer Cuprates in the Multiband Theory of Hubbard Fermions. J Supercond Nov Magn 26, 2607–2609 (2013). https://doi.org/10.1007/s10948-013-2144-1

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  • DOI: https://doi.org/10.1007/s10948-013-2144-1

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