Please use this identifier to cite or link to this item: https://hdl.handle.net/10593/7705
Title: Interplay and competition between superconductivity and charge orderings in the zero-bandwidth limit of the extended Hubbard model with pair hopping and on-site attraction
Authors: Kapcia, Konrad
Keywords: superconductivity
charge orderings
extended Hubbard model
atomic limit
phase separation
local pairing
Issue Date: Aug-2013
Publisher: Springer
Citation: Journal of Superconductivity and Novel Magnetism, Vol. 26, No. 8, 2647-2650 (2013)
Abstract: We present studies of an effective model which is a simple generalization of the standard model of a local pair superconductor with on-site pairing (i.e., the model of hard core bosons on a lattice) to the case of finite pair binding energy. The tight binding Hamiltonian consists of (i) the effective on-site interaction U, (ii) the intersite density-density interactions W between nearest-neighbours, and (iii) the intersite charge exchange term I, determining the hopping of electron pairs between nearest-neighbour sites. In the analysis of the phase diagrams and thermodynamic properties of this model we treat the intersite interactions within the mean-field approximation. Our investigations of the U<0 and W>0 case show that, depending on the values of interaction parameters, the system can exhibit three homogeneous phases: superconducting (SS), charge-ordered (CO) and nonordered (NO) as well as the phase separated SS-CO state.
Sponsorship: National Science Center (NCN) as a research project in years 2011-2013, under grant No. DEC-2011/01/N/ST3/00413; 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"; The Fundation of Adam Mickiewicz University in Poznań
Description: This is an author-created, un-copyedited version of an article accepted for publication in Journal of Superconductivity and Novel Magnetism.
URI: http://link.springer.com/article/10.1007/s10948-013-2152-1
http://hdl.handle.net/10593/7705
DOI: 10.1007/s10948-013-2152-1
ISSN: 1557-1939
Appears in Collections:Artykuły naukowe (WF)

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