Symmetry and Nodes of the Superconducting Gap

TitleSymmetry and Nodes of the Superconducting Gap
Publication TypeJournal Article
Year of Publication1993
AuthorsChen, LA, Tremblay, A-MS
JournalJournal of Physics and Chemistry of Solids
Volume54
Pagination1381–1384
Abstract

For pairing potentials which act only in the vicinity of the Fermi-surface, a Fermi-surface harmonics expansion of the gap function is appropriate. After a general symmetry discussion, it is pointed-out that the first extended s-wave occuring in the Fermi-surface harmonics expansion of the gap function a) is closely related to the usual d-waves b) it can have a large number of nodes. This may reconcile the experiments which see nodes in the gap and neutron-scattering experiments which cannot resolve the anistropy in the gap function.

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