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Unconventional pairing in bipolaronic theories

Hague, J. P.; Kornilovitch, P. E.; Alexandrov, A. S. and Samson, J. H. (2007). Unconventional pairing in bipolaronic theories. Physica C: Superconductivity, 460-46(2) pp. 1121–1122.

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Various mechanisms have been put forward for cuprate superconductivity, which fit largely into two camps: spin-fluctuation and electron–phonon (el–ph) mechanisms. However, in spite of a large effort, electron–phonon interactions are not fully understood away from clearly defined limits. To this end, we use a numerically exact algorithm to simulate the binding of bipolarons. We present the results of a continuous-time quantum Monte-Carlo (CTQMC) algorithm on a tight-binding lattice, for bipolarons with arbitrary interaction range in the presence of strong coulomb repulsion. The algorithm is sufficiently efficient that we can discuss properties of bipolarons with various pairing symmetries. We investigate the effective mass and binding energies of singlet and triplet real-space bipolarons for the first time, and discuss the extensions necessary to investigate d-symmetric pairs.

Item Type: Journal Item
Copyright Holders: 2007 Elsevier B.V
ISSN: 0921-4534
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetEP/C518365/1EPSRC (Engineering and Physical Sciences Research Council)
Not SetEP/D07777X/1EPSRC (Engineering and Physical Sciences Research Council)
Keywords: electron-phonon interactions; strong correlations; bipolaron superconductivity
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Physics
Item ID: 12301
Depositing User: James Hague
Date Deposited: 13 May 2009 14:41
Last Modified: 09 Dec 2018 12:45
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