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

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

中国物理B ›› 2011, Vol. 20 ›› Issue (9): 97202-097202.doi: 10.1088/1674-1056/20/9/097202

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

王建元, 翟薇, 金克新, 陈长乐

School of science, Northwestern Polytechnical University, Xi'an 710072, China

收稿日期:2011-01-29 修回日期:2011-05-11 出版日期:2011-09-15 发布日期:2011-09-15

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

Wang Jian-Yuan(王建元)^†, Zhai Wei(翟薇), Jin Ke-Xin(金克新), and Chen Chang-Le(陈长乐)

School of science, Northwestern Polytechnical University, Xi'an 710072, China

Received:2011-01-29 Revised:2011-05-11 Online:2011-09-15 Published:2011-09-15

摘要/Abstract

摘要： 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.

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.

Key words: manganate, composite, transport property, magnetoresistance

中图分类号: (Conductivity phenomena in semiconductors and insulators)

72.20.-i

72.60.+g (Mixed conductivity and conductivity transitions)

王建元, 翟薇, 金克新, 陈长乐. Transport properties and magnetoresistance in La_0.8Te_0.2MnO₃/ZrO₂ composites[J]. 中国物理B, 2011, 20(9): 97202-097202.

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[J]. Chin. Phys. B, 2011, 20(9): 97202-097202.

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

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

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