Collective Mode in a d_{x^2-y^2} + id_xy Superconductor

A. V. Balatsky, P. Kumar, J. R. Schrieffer

We consider a superconducting state with a mixed symmetry order parameter components, e.g. d+is or d+id' with d'= d_{xy}. We argue for the existence of the new orbital magnetizatio…