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Y0.125Ca0.875MnO3体系的输运性质与铁磁自旋玻璃行为研究

Study on the behaviors of transport properties and ferromagnetic spin-glass for Y0.125Ca0.875MnO3 manganite

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【作者】 陈镇平王春梅李越峰苏玉玲刘德伟李涛张金仓

【Author】 Chen Zhenping1,Wang Chunmei1,Li Yuefeng2,Su Yuling1,Liu Dewei1,Li Tao1,Zhang Jincang1,2 (1.Department of Technology and Physics,Zhengzhou University of Light Industry,Zhengzhou 450002,China)(2.Department of Physics,Shanghai University,Shanghai 200444,China)

【机构】 郑州轻工业学院技术物理系上海大学物理系

【摘要】 研究了类稀土锰氧化物Y0.125Ca0.875MnO3的输运性质和磁特性。结果表明,外加磁场对体系的电输运性能有较大影响,在低温时样品表现出磁电阻效应。在外磁场的诱导下,随温度的降低,体系发生了明显的绝缘-金属(I-M)相变,并且在25K出现了类近藤现象。热磁测量表明零场冷(ZFC)和场冷(FC)的磁化强度曲线在118K出现分叉现象。测量了不同频率下的升降温过程的交流磁化率,结果显示在108K附近出现自旋玻璃态。

【Abstract】 The transport properties and magnetic properties for the rare-earth-like Y0.125Ca0.875MnO3 manganese are systemically studied.The results show that the magnetic field has a stronger impact on electric transport properties for the system,and at low temperature the sample exists a considerable magnetoresistance(MR) effect.At an applied field,the system occurs I-M phase transition obviously with decreasing temperature,and there exists a Kondo-like behavior at 25K.The magnetization measurements show an onset of irreversibility between FC and ZFC at 118K.AC susceptibilities are measured with different frequencies.The results indicate that there exists a ferromagnetic spin-glass(FSG) behavior at 108K.

【基金】 国家自然科学基金项目(10774097,10574087);河南省教育厅自然科学研究计划项目(2008A140014);河南省自然科学基金项目(082300440080)
  • 【文献出处】 低温与超导 ,Cryogenics and Superconductivity , 编辑部邮箱 ,2009年05期
  • 【分类号】O482.5
  • 【被引频次】4
  • 【下载频次】207
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