Effect of Cr Dopingin Mn Site on Low Field Magnetoresistance  of Manganite La0.7Ca0.3MnO3

ZHANG Guang-yu; LIU Lin-jing

doi:10.15938/j.jhust.2019.03.021

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Effect of Cr Dopingin Mn Site on Low Field Magnetoresistance of Manganite La0.7Ca0.3MnO3

更新时间：2026-08-31

- Effect of Cr Dopingin Mn Site on Low Field Magnetoresistance of Manganite La0.7Ca0.3MnO3
- Vol. 24, Issue 3, Pages: 130-133(2019)
- 作者机构：
  
  哈尔滨理工大学理学院,哈尔滨,150080
- 作者简介：
- 基金信息：
- DOI：10.15938/j.jhust.2019.03.021
  CLC： O482
- Published：2019
- 稿件说明：
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ZHANG Guang-yu, LIU Lin-jing. Effect of Cr Dopingin Mn Site on Low Field Magnetoresistance of Manganite La0.7Ca0.3MnO3[J]. 2019, 24(3): 130-133.
DOI：

ZHANG Guang-yu, LIU Lin-jing. Effect of Cr Dopingin Mn Site on Low Field Magnetoresistance of Manganite La0.7Ca0.3MnO3[J]. 2019, 24(3): 130-133. DOI： 10.15938/j.jhust.2019.03.021.

摘要

为了研究钙钛矿亚锰酸盐在较低磁场下的磁电阻效应，采用固相反应法制备了亚锰酸盐多晶样品La0.7Ca0.3Mn1-xCrxO3(x=0

0.1)，测量了两个样品在未加磁场和加0.25T磁场的电阻-温度曲线及磁电阻-温度曲线，分析了Mn位Cr掺杂对样品低场磁电阻效应的影响。实验结果表明，随着Cr掺杂量从x=0增加到x=0.1，样品的金属-绝缘体转变温度逐渐向低温推移，磁电阻峰值温度由TP≈220K下降到TP≈190K。在0.25T磁场下，样品在液氮温区具有较明显的磁电阻效应。

Abstract

In order to study the magnetoresistance effect of perovskitemanganite in low magnetic fields

manganite polycrystalline samples La0.7Ca0.3Mn1-xCrxO3(x=0

0.1) were prepared by solid-state reaction technique Resistance-temperature curves and magnetoresistance-temperaturecurves of the two samples were measured in zero magnetic field and 025 Tmagnetic field Influence of different substitution of Cr for Mn on low fieldmagnetoresistance effects of the samples was analyzed Experimental resultsshowed that the metal-insulatortransition temperature of the samples gradually moved to lower temperature andthe magnetoresistance peak temperature of the samples decreased from TP≈220K toTP≈190K withthe increase of Cr doping from x=0 to x=0.1. The samples showed largemagnetoresistance over liquid nitrogen temperature range in 0.25 T magneticfield.

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