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Title: Metastability and phase separation in a simple model of a superconductor with extremely short coherence length
Authors: Kapcia, Konrad
Keywords: extended Hubbard model
atomic limit
pair hopping
phase diagrams
Issue Date: Apr-2014
Publisher: Springer US, 233 Spring St, New York, NY 10013 USA
Citation: Journal of Superconductivity and Novel Magnetism, Vol. 27, No. 4, 913-917 (2014)
Abstract: We present studies of the atomic limit of the extended Hubbard model with pair hopping for arbitrary electron density and arbitrary chemical potential. The Hamiltonian consists of (i) the effective on-site interaction U and (ii) 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. In this report we focus on metastable phases and determine their ranges of occurrence. Our investigations in the absence of the external magnetic field show that the system analysed exhibits tricritical behaviour. Two metastable phases (superconducting and nonordered) can exist inside the regions of the phase separated state stability and a first-order transition occurs between these metastable phases.
Sponsorship: 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"; 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. The Version of Record is available online at
DOI: 10.1007/s10948-013-2409-8
ISSN: 1557-1939
Appears in Collections:Artykuły naukowe (WF)

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