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|Type:||Artigo de evento|
|Title:||Theory Of High Temperature Superconductivity Beyond Bcs With Realistic Coulomb And Fröhlich Interactions|
|Abstract:||Along with some other researches we have realised that the true origin of high-temperature superconductivity is found in the strong Coulomb repulsion combined with a significant electron-phonon interaction. Both interactions are strong (on the order of 1 eV) compared with the low Fermi energy of doped carriers which makes the conventional BCS-Eliashberg theory inapplicable in cuprates and related doped insulators. Based on our recent analytical and numerical results we argue that high-temperature superconductivity from repulsion alone is impossible for any strength of the Coulomb interaction. Major steps of the alternative polaron theory are outlined starting from the generic Hamiltonian including the unscreened (bare) Coulomb and electron-phonon interactions. The theory accounts for high superconducting critical temperatures, unconventional isotope effects and reconciles tunnelling, photoemission and quantum oscillation data. © 2013 Springer Science+Business Media New York.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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