Transport properties and magnetoresistance in La0.8Te0.2MnO3/ZrO2 composites

doi:10.1088/1674-1056/20/9/097202

Abstract The transport properties and magnetoresistance of electron-doped manganate / insulator composites (La_0.8Te_0.2MnO₃)_{1 - x}/(ZrO₂)_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 ZrO₂ content increases. The introduction of ZrO₂ 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 ZrO₂ 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 ZrO₂ content. This could be attributed to the more remarkable modification effect of magnetic field on ordering degree in the composites than in pure La_0.8Te_0.2MnO₃.

Keywords: manganate composite transport property magnetoresistance

Received: 29 January 2011
Revised: 11 May 2011
Accepted manuscript online:

PACS:	72.20.-i	(Conductivity phenomena in semiconductors and insulators)
	72.60.+g	(Mixed conductivity and conductivity transitions)

Cite this article:

Wang Jian-Yuan(王建元), Zhai Wei(翟薇), Jin Ke-Xin(金克新), and Chen Chang-Le(陈长乐) Transport properties and magnetoresistance in La_0.8Te_0.2MnO₃/ZrO₂ composites 2011 Chin. Phys. B 20 097202

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Transport properties and magnetoresistance in La0.8Te0.2MnO3/ZrO2 composites

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Transport properties and magnetoresistance in La_0.8Te_0.2MnO₃/ZrO₂ composites