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  1. 1 Acta Physica Polonica A

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  1. 1 1993

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  1. 1 Acquarone M.

  2. 1 Paiusco M.

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Magnetic Aspects of Superconducting Pairing

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Acquarone M., Paiusco M.
Acta Physica Polonica A
|
1993
|
vol. 84
|
issue 1
101-126
EN
We discuss some of the recently proposed models dealing with the superconducting state in the presence of strong antiferromagnetic fluctuations, induced by the on-site Coulomb repulsion between electrons (the Hubbard correlation). In the weak coupling limit we treat the influence of correlation effects on the phonon-mediated superconductivity within the BCS-Eliashberg framework. As a non-standard model in this limit we describe next the so-called spin bag model. To discuss strong correlation limit, we describe first the projected Hamiltonian (the t-J Hamiltonian) and the corresponding antiferromagnetic state. The resonating valence bond model is introduced both as a naive version, equivalent to the BCS treatment of the transverse spin fluctuations, as well as a holon-spinon version.
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