Jahn-teller (reverse sign) mechanism for superconductive pairing

R. Englman*, B. Halperin, M. Weger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Band structure calculations and some recent experiments indicate the involvement of both dθ(z2) and dε{lunate}(x2-y2) type states in the carrier states of cuprate superconductors. Electron-phonon coupling, or an excitonic process having similar symmetry properties, leads to a dθ-dε{lunate} pairing mechanism that has the same form as, but a reverse sign to that in the BCS theory so that states that lie close in energy are repelled and those that lie farther apart are attracted. Cooper pairs and gap parameters are derived and are found to be relatively stable against lattice distortion, to be of short range and to exhibit various kinds of isotope effects. The reverse sign model shows stability in situations where dθ and dε{lunate} states are degenerate or are split, the latter provided that the electron-phonon coupling is sufficiently strong so that the superconducting gap energies exceed the splitting.

Original languageEnglish
Pages (from-to)314-324
Number of pages11
JournalPhysica C: Superconductivity and its Applications
Volume169
Issue number3-4
DOIs
StatePublished - 1 Aug 1990

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