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Spin fluctuations and high-temperature superconductivity in cuprates

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Plakida,  Nikolay M.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Plakida, N. M. (2016). Spin fluctuations and high-temperature superconductivity in cuprates. Physica C-Superconductivity and its Applications, 531, 39-59. doi:10.1016/j.physc.2016.10.002.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-3E8B-E
Abstract
To describe the cuprate superconductors, models of strongly correlated electronic systems, such as the Hubbard or t - J models, are commonly employed. To study these models, projected ( Hubbard) operators have to be used. Due to the unconventional commutation relations for the Hubbard operators, a specific kinematical interaction of electrons with spin and charge fluctuations emerges. The interaction is induced by the intraband hopping with a coupling parameter of the order of the kinetic energy of electrons W which is much larger than the antiferromagnetic exchange interaction J induced by the interband hopping. This review presents a consistent microscopic theory of spin excitations and superconductivity for cuprates where these interactions are taken into account within the Hubbard operator technique. The low-energy spin excitations are considered for the t - J model, while the electronic properties are studied using the two-subband extended Hubbard model where the intersite Coulomb repulsion V and electron-phonon interaction are taken into account. (C) 2016 Elsevier B.V. All rights reserved.