Spin-polaron nature of fermion quasiparticles and their d-wave pairing in cuprate superconductors

In the framework of the spin-fermion model, to which the Emery model is reduced in the limit of strong electron correlations, it is shown that the fermion quasiparticles in cuprate high- T c superconductors (HTSCs) arise under a strong effect of exchange coupling between oxygen holes and spins of co...

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Bibliographic Details
Published in:JETP letters 2016-11, Vol.104 (10), p.730-741
Main Authors: Val’kov, V. V., Dzebisashvili, D. M., Barabanov, A. F.
Format: Article
Language:English
Subjects:
Atomic
Biological and Medical Physics
Biophysics
Molecular
Optical and Plasma Physics
Order parameters
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Information Technology
Scientific Summaries
Solid State Physics
Spintronics
Stability
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Summary:In the framework of the spin-fermion model, to which the Emery model is reduced in the limit of strong electron correlations, it is shown that the fermion quasiparticles in cuprate high- T c superconductors (HTSCs) arise under a strong effect of exchange coupling between oxygen holes and spins of copper ions. This underlies the spin-polaron nature of fermion quasiparticles in cuprate HTSCs. The Cooper instability with respect to the d -wave symmetry of the order parameter is revealed for an ensemble of such quasiparticles. For the normal phase, the spin-polaron concept allows us to reproduce the fine details in the evolution of the Fermi surface with the changes in the doping level x observed in experiment for La 2-x Sr x CuO 4 . The calculated T–x phase diagram correlates well with the available experimental data for cuprate HTSCs.
ISSN:0021-3640
1090-6487
DOI:10.1134/S002136401622015X