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Influence of Cr-doping on the magnetic and electrical transport properties of Nd0.75Na0.25MnO3

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【作者】 张兴华； 李志青；

【Author】 ZHANG Xinghua,LI Zhiqing(1.School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300130,China;2.Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology,Tianjin University,Tianjin 300072,China)

【机构】 School of Materials Science and Engineering,Hebei University of Technology； Tianjin Key Laboratory of Low Dimensional Materials Phys-ics and Preparing Technology,Tianjin University；

【摘要】 Polycrystalline Nd0.75Na0.25Mn1-xCrxO3(0≤x≤0.1) samples were prepared by sol-gel method and their magnetic and electrical transport properties were investigated experimentally.The parent compound with x=0 was a charge ordered manganite and the charge ordering transition occurred at 170 K.For lower Cr concentration(x<0.03),the samples preserved the charge ordering features of the parent compound,but the charge ordering transition temperature decreased with increasing x,in particular from 170 K for x=0 to 154 K for x=0.02.For the x≥0.03 samples,paramagnetic to ferromagnetic phase transition took place and the Curie temperature increased from 112.8 K for x=0.04 to 125.5 K for x=0.1.The electrical transport properties were also influenced by Cr doping.For x<0.03,the samples displayed insulator characteristics below 300 K.For x=0.04,the sample showed insulator-metal transition around 75 K.For x≥0.05,the insulator-metal transition disappeared and the compounds showed insulator features again.The magnetic and electrical properties could be well explained by the phase separation scenario.

【Abstract】 Polycrystalline Nd0.75Na0.25Mn1-xCrxO3(0≤x≤0.1) samples were prepared by sol-gel method and their magnetic and electrical transport properties were investigated experimentally.The parent compound with x=0 was a charge ordered manganite and the charge ordering transition occurred at 170 K.For lower Cr concentration(x<0.03),the samples preserved the charge ordering features of the parent compound,but the charge ordering transition temperature decreased with increasing x,in particular from 170 K for x=0 to 154 K for x=0.02.For the x≥0.03 samples,paramagnetic to ferromagnetic phase transition took place and the Curie temperature increased from 112.8 K for x=0.04 to 125.5 K for x=0.1.The electrical transport properties were also influenced by Cr doping.For x<0.03,the samples displayed insulator characteristics below 300 K.For x=0.04,the sample showed insulator-metal transition around 75 K.For x≥0.05,the insulator-metal transition disappeared and the compounds showed insulator features again.The magnetic and electrical properties could be well explained by the phase separation scenario.

【关键词】 rare earth manganites； charge ordering； phase separation；
【Key words】 rare earth manganites； charge ordering； phase separation；
【基金】 supported by the Key Project of Chinese Ministry of Education(109042);Natural Science Foundation of Tianjin City(10JCYBJC02400)
  • 【文献出处】 Journal of Rare Earths ,稀土学报(英文版) , 编辑部邮箱 ,2011年03期
  • 【分类号】TG132.27
  • 【被引频次】1
  • 【下载频次】33
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