The implications of the two-pocket Fermi surface for macroscopic quantum phenomena are considered. We demonstrate that in the case of the two-pocket Fermi surface the g-wave pairing is closely related to the d-wave one. This system can be described in terms of two almost degenerate superconducting condensates. As a result a new spatial scale lγ, much larger than the superconducting correlation length ξ, arises. The Josephson tunneling for such two-component system has very special properties. We prove that the presence of the g-wave does not contradict the existing SQUID experimental data on tunneling in the ab-plane. We also discuss the possible ways to experimentally reveal the g-wave component in a single tunnel junction as well as in SQUID experiments.
|Number of pages
|Physica C: Superconductivity and its Applications
|Published - 1 Feb 1998
- Cuprate superconductors
- Josephson tunneling