| Cr替代Mn对La0.4Ca0.6MnO3磁性质的影响 |
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| 引用本文： | 王桂英,杨刚,郭焕银,毛强,叶吾梅,彭振生. Cr替代Mn对La0.4Ca0.6MnO3磁性质的影响[J]. 无机材料学报, 2011, 0(4): 411-416 |
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| 作者姓名： | 王桂英 杨刚 郭焕银 毛强 叶吾梅 彭振生 |
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| 作者单位： | 自旋电子与纳米材料安徽省重点实验室(培育基地);宿州学院电子与电气工程系;中国科学技术大学合肥微尺度物质科学国家实验室; |
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| 基金项目： | 国家自然科学基金重点项目(19934003); 安徽省教育厅自然科学研究项目(KJ2008A19ZC,KJ2008A34ZC,KJ2009B281Z,KJ2010B228,KJ2010B229)~~ |
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| 摘 要： | 用固相反应法制备了La0.4Ca0.6Mn1-xCrxO3(x=0.00,0.02,0.04,0.06,0.08,0.10,0.15)多晶样品,通过X射线衍射(XRD)图谱、磁化强度-温度(M-T)曲线、电子自旋共振(ESR)谱线,研究了Cr替代Mn对La0.4Ca0.6MnO3磁性质的影响.实验结果表明:La0.4Ca0.6MnO3存在复杂的磁结构,在258 K出现电荷有序相,从175 K到50 K,产生强关联CO-AFM(电荷有序?反铁磁)相,温度降到41 K左右出现自旋玻璃态;当替代量x≥0.06时,电荷有序相被融化;当x≥0.10时,自旋玻璃态被融化.对实验结果进行了初步解释:电荷有序相被融化主要原因是Cr3+与Mn4+具有相同的电子结构,Cr3+替代Mn3+破坏了CE型反铁磁的自旋序,从而引起电荷序的坍塌,实验证明了电荷序CE型反铁磁体系中,电荷序和自旋序之间存在强耦合相互作用;自旋玻璃态的融化,是由于Cr替代Mn破坏了自旋玻璃态的生成条件,即反铁磁背景下有少量铁磁成分.
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| 关 键 词： | La0.4La0.6MnO3 Cr掺杂 电荷有序 自旋玻璃 |
Influence of the Substitution of Cr for Mn on Magnetic Properties of La_(0.4)Ca_(0.6)MnO_3 |
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| WANG Gui-Ying,,YANG Gang,GUO Huan-Yin,MAO Qiang,YE Wu-Mei,PENG Zhen-Sheng. Influence of the Substitution of Cr for Mn on Magnetic Properties of La_(0.4)Ca_(0.6)MnO_3[J]. Journal of Inorganic Materials, 2011, 0(4): 411-416 |
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| Authors: | WANG Gui-Ying YANG Gang GUO Huan-Yin MAO Qiang YE Wu-Mei PENG Zhen-Sheng |
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| Affiliation: | WANG Gui-Ying1,2,YANG Gang1,GUO Huan-Yin1,MAO Qiang1,YE Wu-Mei1,PENG Zhen-Sheng1,3(1.Cultivating Base of Anhui Key Laboratory of Spintronic and Nanometric Materials,Suzhou 234000,China,2.Department of Electronics and Electric Engineering,Suzhou College,3.Hefei National Laboratory of Micro-scale Matter Science,University of Science and Technology of China,Hefei 230026,China) |
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| Abstract: | Polycrystalline samples of La0.4Cao.6Mn1?xCrxO3(x=0.00,0.02,0.04,0.06,0.08,0.10,0.15)were prepared by the solid state reaction method.The influence of Cr3+ substitution for Mn3+ on the magnetic property and charge ordering phase of La0.4Ca0.6MnO3 was studied through the measurements of X-ray diffraction(XRD),magnetization-temperature(M-T) curves and electron spin resonance(ESR) spectra.The experimental results indicate that the sample of La0.4Ca0.6MnO3 has very complicated magnetic structure.The charge orde... |
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| Keywords: | La0.4Cao.6MnO3 Cr-doping charge ordering spin-glass state |
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