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The transport properties and magnetoresistance of electron-doped manganate /insulator composites (La 0.8 Te 0.2 MnO 3) 1-x /(ZrO 2) x (x=0,0.3,and 0.5) are investigated.It is found that the metal-insulator transition temperature of this system shifts to a lower value as the ZrO 2 content increases.The introduction of ZrO 2 enhances both the domain scattering and electron relative scattering in the metal transport region.In the adiabatic small polaron hopping transport region,the thermal activation energy seems invariable regardless of the ZrO 2 content.The application of a magnetic field promotes the charge transportation capabilities of the composites,and the magnetoresistance is enhanced with an increase of the ZrO 2 content.This could be attributed to the more remarkable modification effect of magnetic field on ordering degree in the composites than in pure La 0.8 Te 0.2 MnO 3.
The transport properties and magnetoresistance of the electron-doped manganate / insulator composites (La 0.8 Te 0.2 MnO 3) 1-x / (ZrO 2) x (x = 0,0.3, and 0.5) insulator transition temperature of this system shifts to a lower value as the ZrO 2 content increases. The introduction of ZrO 2 enhances both the domain scattering and electron relative scattering in the metal transport region. the adiabatic small polaron hopping transport region, the thermal activation energy seems invariable regardless of the ZrO 2 content. the application of a magnetic field promotes the charge transportation capabilities of the composites, and the magnetoresistance is enhanced with an increase of the ZrO 2 content. This could be be distributed to the more remarkable modification effect of magnetic field on ordering degree in the composites than in pure La 0.8 Te 0.2 MnO 3.