Theory of High-Temperature Superconductivity in Cuprates

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• 作者：N. M. Plakida ; V. S. Oudovenko
• 关键词：High ; temperature superconductivity ; Strongly correlated electronic systems ; Hubbard model ; Cuprates
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：29
• 期：4
• 页码：1037-1042
• 全文大小：559 KB
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• 作者单位：N. M. Plakida (1)
  V. S. Oudovenko (2)
  
  1. Joint Institute for Nuclear Research, Dubna, 141980, Russia
  2. Rutgers University, New Brunswick, NJ, 08854, USA
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947

文摘

We propose a microscopic theory of superconductivity for systems with strong electron correlations such as cuprates in the framework of the extended Hubbard model where the intersite Coulomb repulsion and electron-phonon interaction (EPI) are taken into account. The Dyson equation for the normal and pair Green functions for the Hubbard operators (HOs) is derived. Due to the unconventional commutation relations for the HOs, a specific kinematical interaction of electrons with spin and charge fluctuations with a large coupling constant of the order of the kinetic energy of electrons W emerges that results in the d-wave pairing with high- T _c . Superconductivity can be suppressed only for a large intersite Coulomb repulsion \(V \gtrsim W\). Isotope effect on T _c caused by electron-phonon interaction is weak at optimal doping and increases at low doping. The kinematical interaction is absent in the spin-fermion models and is lost in the slave-boson (-fermion) models treated in the mean-field approximation.