High Temperature Superconductivity in Strongly Correlated Electronic Systems

Journal article


Dunne, LJ, Brändas, EJ and Cox, H (2016). High Temperature Superconductivity in Strongly Correlated Electronic Systems. Advances in Quantum Chemistry.
AuthorsDunne, LJ, Brändas, EJ and Cox, H
Abstract

Abstract In this paper we give a selective review of our work on the role of electron correlation in the theory of high temperature superconductivity. The question of how electronic repulsions might give rise to off-diagonal long range order (ODLRO) in high temperature superconductors is currently one of the key questions in the theory of condensed matter. This paper argues that the key to understanding the occurrence of high temperature superconductivity (HTSC) in cuprates is to be found in the Bohm-Pines Hamiltonian modified to include a polarisable dielectric background. The approach uses reduced electronic density matrices and discusses how these can be used to understand whether ODLRO giving rise to superconductivity might arise from a Bohm-Pines type potential which is comprised of a weak long-range attractive tail and a much stronger short-range repulsive Coulomb interaction. This allows time-reversed electron pairs to undergo a superconducting condensation on alternant Cuprate lattices. Thus, a detailed summary is given of the arguments that such interacting electrons can cooperate to produce a superconducting state in which time-reversed pairs of electrons effectively avoid the repulsive hard-core of the inter-electronic Coulomb interaction but reside on average in the attractive well of the effective potential. In a superconductor the plasma wave function becomes the longitudinal component of a massive photon by the Anderson-Higgs mechanism. The alternant cuprate lattice structure is the key to achieving HTSC in cuprates with dx2-y2 symmetry condensate symmetry.

KeywordsOff-diagonal Long-Range Order (ODLRO), cuprate superconductivity, strongly correlated electronic systems, Bohm-Pines, Plasmon, Anderson-Higgs mechanism, condensate wave function.
Year2016
JournalAdvances in Quantum Chemistry
PublisherElsevier
ISSN0065-3276
Digital Object Identifier (DOI)doi:10.1016/bs.aiq.2016.06.003
Publication dates
Print25 Jul 2016
Publication process dates
Deposited07 Jul 2016
Accepted06 Jun 2016
Accepted author manuscript
License
CC BY-NC-ND 4.0
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https://openresearch.lsbu.ac.uk/item/87318

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