| Cr掺杂对BaxSr1-xRuO3体系磁性和输运性质的影响 |
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| 引用本文： | 刘伟鹏,皮雳.Cr掺杂对BaxSr1-xRuO3体系磁性和输运性质的影响[J].低温物理学报,2012(2):81-85. |
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| 作者姓名： | 刘伟鹏 皮雳 |
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| 作者单位： | 中国科学技术大学微尺度国家实验室 |
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| 基金项目： | 科技部国家重大科学研究计划(批准号:2010CB923403)资助的课题~~ |
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| 摘 要： | 本文采用固相反应法制备了BaxSr1-xRuO3和BaxSr1-xRu0.9Cr0.1O3两组样品,对比研究了它们磁性和电输运性质.当掺杂量少于0.2时,体系处于有少许畸变的钙钛矿的3C结构,Cr的掺入很大幅度提高了体系的铁磁转变温度Tc,电输运性质上也由坏金属行为转变为Mott绝缘体的行为,并且在铁磁相变附近出现电阻拐点.当掺杂量大于等于0.2时,体系发生结构相变,由畸变钙钛矿3C结构变为6 M的单斜结构.这时,Cr的掺入对体系的影响并不明显.这些结果表明引起SrRuO3铁磁转变温度升高的Ru+5-O-Cr+3相互作用对晶格结构有强烈的依赖关系.
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| 关 键 词： | 铁磁转变 晶格结构 |
Cr-DOPING EFFECT ON MAGNETIC AND TRANSPORT PROPERTIES OF BaxSr1-xRuO3 |
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| U Wei-peng,I li.Cr-DOPING EFFECT ON MAGNETIC AND TRANSPORT PROPERTIES OF BaxSr1-xRuO3[J].Chinese Journal of Low Temperature Physics,2012(2):81-85. |
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| Authors: | U Wei-peng I li |
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| Institution: | Hefei national laboratory for physical science at the microscale,University of Science and Technology of China,Hefei,230026 |
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| Abstract: | We prepared two series of compounds BaxSr1-xRuO3 and BaxSr1-xRu0.9Cr0.1O3 by the solid state reaction method and compared their magnetic and transport properties.When x<0.2,the polycrystalline structure is regarded as a three-layered(3C) perovskite structure with a distortion.The Cr-doping can greatly improve the ferromagnetic transition temperature Tc,and the transport properties change from the Mott insulator into the bad metal and a turning point in resistance appears at the Curie temperature.For samples x>～0.2,a phase transition is observed.The system become a six-layered monoclinic(6M) structure and the Cr-doping will not significantly affect the properties of the system.These results show that Ru+5-O-Cr+3interaction,which is the major cause for the increase of Tc in Cr-doping in SrRuO3,strongly depend upon the lattice structure of the system. |
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| Keywords: | ferromagnetic transition lattice structure |
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