Small Magnetic Polaron Picture of Colossal Magnetoresistance in   Manganites
  We present a small-but-sizeable magnetic polaron picture where transport at high temperatures is activated while at low temperatures it is band-like. We show that both double exchange and finite bandwidth effects are important to understand colossal magnetoresistance as well as the coincidence of the metal-insulator and the ferromagnetic transitions in manganites. The magnetic transition is explained using band-like motion of the polarons. 
Sudhakar Yarlagadda (Saha Institute of Nuclear Physics, Calcutta,   India)