TRANSPORT-PROPERTIES OF MANGANATES WITH GIANT MAGNETORESISTANCE

A short review of transport properties related to the giant magnetores istance in perovskite-type double-exchange ferromagnets is presented. The paper deals with the essential experimental results for the unders tanding of the large MR effect, which is based on the correlation of e lectric and magnetic properties. These experiments are mainly the depe ndence of the resistivity on temperature and magnetic field, and also on the chemical composition, In the region of the highest magnetoresis tance, which usually occurs close to a magnetic transition, a peak in resistivity indicates the strong spin disorder scattering. Even locali zation of charge carriers and thus a metal-insulator transition occurs in some cases.