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Title: Unconventional pairing symmetry of layered superconductors caused by acoustic phonons
Authors: Alexandrov, A.S.
Issue Date: 2008
Publisher: © American Physical Society
Citation: ALEXANDROV, A.S., 2008. Unconventional pairing symmetry of layered superconductors caused by acoustic phonons. Physical Review B, 77(9), 094502 pp. 1-5.
Abstract: An inevitable anisotropy of sound velocity in crystals makes the phonon-mediated attraction of electrons nonlocal in space providing unconventional Cooper pairs with a nonzero orbital momentum. As a result of this anisotropy, quasi-two-dimensional charge carriers weakly coupled with acoustic phonons undergo a quantum phase transition from a conventional s-wave to an unconventional d-wave superconducting state with less carriers per unit cell. In the opposite strong-coupling regime, rotational symmetry breaking appears as a result of a reduced Coulomb repulsion between unconventional bipolarons dismissing thereby some constraints on unconventional pairing in the Bose-Einstein condensation limit. The conventional acoustic phonons, and not superexchange, are shown to be responsible for the d-wave symmetry of cuprate superconductors, where the on-site Coulomb repulsion is large.
Description: This article has been published in the journal, Physical Review B [© American Physical Society]. The definitive version is available at: http://link.aps.org/doi/10.1103/PhysRevB.77.094502
Version: Published
DOI: 10.1103/PhysRevB.77.094502
URI: https://dspace.lboro.ac.uk/2134/4251
ISSN: 1098-0121
Appears in Collections:Published Articles (Physics)

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