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Pseudogap in high-temperature superconductors from realistic Frohlich and Coulomb interactions

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journal contribution
posted on 2013-01-31, 15:03 authored by G. Sica, John Samson, A.S. Alexandrov
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.

History

School

  • Science

Department

  • Physics

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.)

Publisher

© EPLA (Europhysics Letters Association)

Version

  • AM (Accepted Manuscript)

Publication date

2012

ISSN

0295-5075

Language

  • en

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