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Optimal interlayer hopping and high temperature Bose–Einstein condensation of local pairs in quasi 2D superconductors

Kornilovitch, P. E. and Hague, J. P. (2015). Optimal interlayer hopping and high temperature Bose–Einstein condensation of local pairs in quasi 2D superconductors. Journal of Physics: Condensed Matter, 27(7), article no. 075602.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1088/0953-8984/27/7/075602
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Abstract

Both FeSe and cuprate superconductors are quasi 2D materials with high transition temperatures and local fermion pairs. Motivated by such systems, we investigate real space pairing of fermions in an anisotropic lattice model with intersite attraction, V, and strong local Coulomb repulsion, U, leading to a determination of the optimal conditions for superconductivity from Bose–Einstein condensation. Our aim is to gain insight as to why high temperature superconductors tend to be quasi 2D. We make both analytically and numerically exact solutions for two body local pairing applicable to intermediate and strong V. We find that the Bose–Einstein condensation temperature of such local pairs pairs is maximal when hopping between layers is intermediate relative to in-plane hopping, indicating that the quasi 2D nature of unconventional superconductors has an important contribution to their high transition temperatures.

Item Type: Journal Item
Copyright Holders: 2015 IOP Publishing Ltd
ISSN: 1361-648X
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Biomedical Research Network (BRN)
Item ID: 44410
Depositing User: James Hague
Date Deposited: 22 Sep 2015 08:44
Last Modified: 08 Oct 2016 07:36
URI: http://oro.open.ac.uk/id/eprint/44410
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