Ferron Type of Coductivity in Metal CuFeSe2
  It is pointed out, that the charge transfer in the compound in paramagnetic region has a ferron type of transport with ferrons of a small radius, predicted by N. Mott. For some another specimen the charge transfer may be carried out by ferrons of a large radius at very low temperatures. The results are well confirmed by the temperature dependence of resistivity and by metal type of the compound. 
A.M. Polubotko
cond-mat.mtrl-sci