Quantum Spin Fluctuations as a Source of Long-Range Proximity Effects in   Diffusive Ferromagnet-Superconductor Structures
  We show that quantum spin fluctuations in inhomogeneous ferromagnets drastically affect the Andreev reflection of electrons and holes at a ferromagnet-superconductor interface. As a result a strong long-range proximity effect appears, associated with electron-hole spin triplet correlations and persisting on a lenght scale typical for non-magnetic materials, but anomalously large for ferromagnets. 
A. Kadigrobov, R. I. Shekhter, and M. Jonson