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不同Ce掺杂比例对La1-xCexMnO3薄膜输运性质及机理研究
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西北工业大学,西北工业大学,西北工业大学,西北工业大学

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Transport Properties and Mechanisms Modulated by Doping Ratio of Ce in La1-xCexMnO3 Electronic-doped Films
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Northwestern Polytechnical University,Northwestern Polytechnical University,Northwestern Polytechnical University,Northwestern Polytechnical University

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National?Natural?Science?Foundation?of?China

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    摘要:

    本文中研究了电子型掺杂钙钛矿薄膜La1-xCexMnO3的输运性质和外场作用下的输运机理。研究表明,La1-xCexMnO3薄膜呈现出典型的金属-绝缘体转变,且与Ce的掺杂浓度相关。电阻温度曲线表明,在低温时,电子-电子散射和磁畴对电子的散射是电阻形成的主要原因,而在高温下小极化子的跳跃机制起主要贡献。通过激光照射样品表面,发现光场诱导金属绝缘体转变温度向着低温区间偏移,该现象产生的原因在于La1-xCexMnO3薄膜内部铁磁相与顺磁相的共存,此外,高能量的激光对样品的电阻变化影响更明显。进一步研究表明,Ce的掺杂浓度将会通过金属-绝缘相变对La1-xCexMnO3的磁电阻效应产生显著的调制作用。本文将为新型能量转换器件的开发与应用提供新的研究思路。

    Abstract:

    In this letter, we perform the experimental studies on La1-xCexMnO3 to investigate transport properties and field-induced transport mechanisms in electronic doped perovskite films. La1-xCexMnO3films exhibit significant metal-insulator transition, which can be modulated by the doping ratio of Ce. Resistance-temperature curves indicate that the magnetic domains and electron-electron scattering mainly contribute to the transport mechanism in the low temperature region, while the hopping conduction of small polaron becomes the dominating factor at the high temperatures. Laser irradiation was found to induce the shift of metal-insulator transition temperature towards the lower temperature region due to the coexistence of ferromagnetic (FM) metallic phase and paramagnetic (PM) insulating phase in La1-xCexMnO3 films. The higher laser intensity gives rise to more significant change in resistance. Furthermore, magnetoresistance effect can be affected by different doping ratios of Ce in La1-xCexMnO3 films Because of the MIT transition. Our findings are expected to drive the development and application for the new energy transducer devices.

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牛利伟,陈长乐,王建元,金克新.不同Ce掺杂比例对La1-xCexMnO3薄膜输运性质及机理研究[J].稀有金属材料与工程,2018,47(2):491~495.[Liwei Niu, Changle Chen, Jianyuan Wang, KeXin Jin. Transport Properties and Mechanisms Modulated by Doping Ratio of Ce in La1-xCexMnO3 Electronic-doped Films[J]. Rare Metal Materials and Engineering,2018,47(2):491~495.]
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  • 收稿日期:2017-05-15
  • 最后修改日期:2017-10-09
  • 录用日期:2017-10-10
  • 在线发布日期: 2018-03-15
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