The effect of annealing on the magnetoresistance of polycrystalline (La - Y - Ca) perovskites

Abstract

The magnetization, resistivity and magnetoresistance of yttrium-doped polycrystalline have been studied as a function of annealing conditions. The magnetoresistance amplitude depends upon the annealing time, with an optimum corresponding to 12 h annealing at under oxygen. Different contributions to the magnetoresistance are separated; the first is related to the technical magnetization, the second, dominant one, to the influence of the total magnetic induction on the band splitting and the spin correlation function.

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