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.

DOI: https://doi.org/10.1016/j.physc.2007.03.234

Abstract

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.

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About

• Item ORO ID
• 12301
• Item Type
• Journal Item
• ISSN
• 0921-4534
• Project Funding Details

• Funded Project Name	Project ID	Funding Body
  Not Set	EP/C518365/1	EPSRC (Engineering and Physical Sciences Research Council)
  Not Set	EP/D07777X/1	EPSRC (Engineering and Physical Sciences Research Council)

• Keywords
• electron-phonon interactions; strong correlations; bipolaron superconductivity
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Research Group
• Physics
• Copyright Holders
• © 2007 Elsevier B.V
• Depositing User
• James Hague