Abstract
The spin-dependent intergranular tunneling in granular perovskites La 0.82Sr 0.18MnO 3 has been investigated. A series of experimental evidences, including magnetization, heat capacity, structure distortions and magnetoresistance, have been given to demonstrate that the intergranular tunneling stems from a spin-dependent surface effect, which is related to the magnetic difference between the core and the surface of the perovskite grain, and the related tunnel-type magnetoresistance results from a field-induced change of interfacial magnetic configuration.
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