CONTROLLED TEMPERATURE BROADENING OF COLOSSAL MAGNETORESISTANCE IN A MANGANITE HETEROSTRUCTURE

An intrinsic characteristic of the ''colossal'' magnetoresistance mang anite compounds is that the resistance and the magnetoresistance vary strongly with temperature over the small temperature regime in which t he magnetoresistance is exceptionally large. We propose a heterostruct ure constructed of layers of varying composition manganites which exte nds the regime of large magnetoresistance and greatly broadens the sha rp peak in resistance. Data from a prototype heterostructure are prese nted that demonstrate the effectiveness of this method. (C) 1997 Ameri can Institute of Physics.