The Primary Role of Ionic Polarizability in Exotic Superconductivity |
| M. Weger Racah Institute of Physics, Hebrew University, Jerusalem, Israel |
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| The ionic polarizability of organic metals and of high-Tc 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 λph 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. |
| DOI: 10.12693/APhysPolA.87.723 PACS numbers: 74.70.Kn, 74.72.-v, 72.15.-h, 71.45.Gm |