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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/11612

Title: Pseudogap in high-temperature superconductors from realistic Frohlich and Coulomb interactions
Authors: Sica, G.
Samson, J.H.
Alexandrov, A.S.
Issue Date: 2012
Publisher: © EPLA (Europhysics Letters Association)
Citation: SICA, G., SAMSON, J.H. and ALEXANDROV, A.S., 2012. Pseudogap in high-temperature superconductors from realistic Frohlich and Coulomb interactions. EPL (Europhysics Letters), 100 (3), 37005 (6pp.)
Abstract: It has been recently shown that the competition between unscreened Coulomb and Frohlich electron-phonon interactions can be described in terms of a short-range spin exchange Jp and an effective on-site interaction ˜U in the framework of the polaronic t-Jp-˜U 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.
Version: Accepted for publication
DOI: 10.1209/0295-5075/100/37005
URI: https://dspace.lboro.ac.uk/2134/11612
Publisher Link: http://dx.doi.org/10.1209/0295-5075/100/37005
ISSN: 0295-5075
Appears in Collections:Published Articles (Physics)

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