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  1. 1 Acta Physica Polonica A

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  1. 1 1995

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  1. 1 Weger M.

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The Primary Role of Ionic Polarizability in Exotic Superconductivity

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Weger M.
Acta Physica Polonica A
|
1995
|
vol. 87
|
issue 4-5
723-733
EN
The ionic polarizability of organic metals and of high-T_{c} cuprates is very high while the density of conduction electrons is low. As a result, the ionic polarizability screens out the electronic polarizability for states very close to the Fermi surface. The cut-off is determined by the dispersion of the ionic polarizability. The electron-phonon matrix element is very large for the ionically screened states, and is the cut-off for the electronically screened states. Therefore, the McMillan coupling constant λ_{ph} is very large at very low energies, and has a low energy cut-off. This model accounts for both normal and superconducting state anomalies in organic metals, as well as cuprates.
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