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Unconventional pairing symmetry of layered superconductors caused by acoustic phonons

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journal contribution
posted on 19.02.2009 by A.S. Alexandrov
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.

History

School

  • Science

Department

  • Physics

Citation

ALEXANDROV, A.S., 2008. Unconventional pairing symmetry of layered superconductors caused by acoustic phonons. Physical Review B, 77(9), 094502 pp. 1-5.

Publisher

© American Physical Society

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VoR (Version of Record)

Publication date

2008

Notes

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

ISSN

1098-0121

Language

en

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