Giant frequency dependence of dynamic freezing in nanocrystalline   ferromagnetic LaCo0.5Mn0.5O3
  This paper is withdrawn now and soon will be replaced by a complete study on LaCo0.5-MgxMn0.5O3. 
R. Mahendiran, Y. Briead, M. Hervieu, B. Raveau, and P. Schiffer