Samson-Manuscript.pdf (1.27 MB)
Pseudogap in high-temperature superconductors from realistic Frohlich and Coulomb interactions
journal contribution
posted on 2013-01-31, 15:03 authored by G. Sica, John Samson, A.S. AlexandrovIt 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
2012ISSN
0295-5075Publisher version
Language
- en