| Issue |
EPL
Volume 100, Number 3, November 2012
|
|
|---|---|---|
| Article Number | 37005 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/100/37005 | |
| Published online | 22 November 2012 | |
Pseudogap in high-temperature superconductors from realistic Fröhlich and Coulomb interactions
1 Dipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno - I-84084 Fisciano (SA), Italy, EU
2 Department of Physics, Loughborough University - Loughborough LE11 3TU, UK, EU
3 Instituto de Física “Gleb Wataghin”, Universidade Estadual de Campinas, UNICAMP 13083-970, Campinas, São Paulo, Brasil
(a) gerardo.sica@physics.unisa.it
Received: 27 August 2012
Accepted: 24 October 2012
It has been recently shown that the competition between unscreened Coulomb and Fröhlich electron-phonon interactions can be described in terms of a short-range spin exchange Jp and an effective on-site interaction 
in the framework of the polaronic t-Jp- model. This model, that provides an explanation for high-temperature superconductivity in terms of Bose-Einstein condensation (BEC) of small and light bipolarons, is now studied as a charged Bose-Fermi mixture. Within this approximation, we show that a gap between bipolaron and unpaired polaron bands results in a strong suppression of low-temperature spin susceptibility, specific heat and tunnelling conductance, signalling the presence of a pseudogap regime in the normal state without any assumptions on pre-existing orders or broken symmetries in the normal state of the model.
PACS: 74.72.Kf – Pseudogap regime / 74.20.-z – Theories and models of superconducting state / 71.38.-k – Polarons and electron-phonon interactions
© EPLA, 2012
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