Symmetry and Nodes of the Superconducting Gap
|Title||Symmetry and Nodes of the Superconducting Gap|
|Publication Type||Journal Article|
|Year of Publication||1993|
|Authors||Chen LA, Tremblay A-MS|
|Journal||Journal of Physics and Chemistry of Solids|
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.