Electron phase separations involving superconductivity in the extended Hubbard models with pair hopping interaction
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Date
2015-02
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Polish Academy of Sciences, Institute of Physics, al. Lotników 32-46, PL-02-668 Warsaw, Poland
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Abstract
In this work the extended Hubbard models with pair hopping interaction (at the atomic limit) are investigated within the variational approach, which treats the on-site interaction term exactly and the intersite interactions within the mean-field approximation (exact in $d\rightarrow+\infty$).
We analyze mutual stability of the superconducting (SC) phase and charge (CO) or (ferro/antiferro-)magnetic (M) orderings as well as homogeneous mixed phases.
Our preliminary results for U=0 show that the SC phase can coexist with the CO or M phases only in states with electron phase separation.
Description
This is an author-created, un-copyedited version of an article accepted for publication in Acta Physica Polonica A.
Sponsor
National Science Center (NCN) as a research project in years 2011-2013, under grant No. DEC-2011/01/N/ST3/00413; National Science Center (NCN) as a doctoral scholarship in years 2013-2014 No. DEC- 2013/08/T/ST3/00012; European Commission and Ministry of Science and Higher Education (Poland) - partial financial support from European Social Fund – Operational Programme "Human Capital" – POKL.04.01.01-00-133/09-00 – "Proinnowacyjne kształcenie, kompetentna kadra, absolwenci przyszłości"
Keywords
extended Hubbard model, atomic limit, superconductivity, charge-order, magnetism, phase separation, mean-field approximation, pair hopping
Citation
Acta Physica Polonica A, Vol. 121, No. 2, 204-206 (2015)