Superconductivity induced by magnetic field?

It is shown that the effect of the giant negative magnetoresistance in doped manganite can be explained in the framework of the model based on the accounting of the covalence of the transition metal-oxygen binding. This effect is connected with the delocalization of π-electrons along the asymmetric π-orbitals belonging to chains of covalently bond ions of Mn and O. The delocalization of π-electrons in manganite is induced by the magnetic field orienting the ferromagnetically unpaired π-electrons and permitting the collective motion along the π-orbital at conditions of the ferromagnetic ordering of manganese ions