Gap-function anisotropy and collective modes in a bilayer superconductor with Cooper-pair tunneling

Wen Chin Wu, A. Griffin

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We study the gap-function anisotropy and collective mode spectrum (ω≤2Δ) of the Anderson-Chakravarty model for high-Tc oxides based on Cooper-pair tunneling in a bilayer (with strength TJ). For both s-wave and d-wave pairing in the layers, the shape of the gap around the Fermi surface is strongly dependent on TJ. Besides the usual Anderson-Bogoliubov phase and Littlewood-Varma amplitude modes, we find branches (optical phononlike modes) involving fluctuations of the relative phase and amplitude of the order parameters of the two layers. These modes are the dynamic signature of the Cooper-pair tunneling model since their energy and damping depends critically on the relative magnitudes of the Cooper-pair tunneling strength (TJ) and the pairing interaction (g), but not significantly on the symmetry of the pairing. The generalization to a trilayer system (which can arise in Bi, Tl, and Hg copper oxides) is briefly discussed.

Original languageEnglish
Pages (from-to)15317-15328
Number of pages12
JournalPhysical Review B
Volume51
Issue number21
DOIs
Publication statusPublished - 1995 Jan 1

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Superconducting materials
Anisotropy
anisotropy
Fermi surface
Copper oxides
Oxides
Damping
copper oxides
Fermi surfaces
damping
signatures
oxides
symmetry
interactions
energy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Gap-function anisotropy and collective modes in a bilayer superconductor with Cooper-pair tunneling. / Wu, Wen Chin; Griffin, A.

In: Physical Review B, Vol. 51, No. 21, 01.01.1995, p. 15317-15328.

Research output: Contribution to journalArticle

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