  We investigate the coupling between two singlet superconductors separated by
a half-metallic magnet. The mechanism behind the coupling is provided by the
rotation of the quasiparticle spin in the superconductor during reflection
events at the interface with the half metal. Spin rotation induces triplet
correlations in the superconductor which, in the presence of surface spin-flip
scattering, result in an indirect Josephson effect between the superconductors.
We present a theory appropriate for studying this phenomenon and calculate
physical properties for a superconductor/half metal/superconductor (S/HM/S)
heterostructure.
