Frustration in d-wave Superconducting Circuits: -Ring Behaviour
arXiv:cond-mat/0006033
Abstract
A closed superconducting circuit containing an odd number of -junctions, a -ring, has a finite current in the ground state. We explicitly construct such rings for d-wave superconductors and demonstrate the existence of spontaneous currents by direct self-consistent solutions to the Bogoliubov de Gennes equations. We show that the current has a topological origin due to the frustration of the d-wave order parameter, which is only partially explained by the Sigrist-Rice tunneling formula.
Submitted for Physical Review Letters. 5 figures, 4 pages, 2 column format