1-xCexMnO3的輸運(yùn)性質(zhì)和外場作用下的輸運(yùn)機(jī)理。研究表明,La1-xCexMnO3薄膜呈現(xiàn)出典型的金屬-絕緣體轉(zhuǎn)變,且與Ce的摻雜濃度相關(guān)。電阻溫度曲線表明,在低溫時(shí),電子-電子散射和磁疇對電子的散射是電阻形成的主要原因,而在高溫下小極化子的跳躍機(jī)制起主要貢獻(xiàn)。通過激光照射樣品表面,發(fā)現(xiàn)光場誘導(dǎo)金屬絕緣體轉(zhuǎn)變溫度向著低溫區(qū)間偏移,該現(xiàn)象產(chǎn)生的原因在于La1-xCexMnO3薄膜內(nèi)部鐵磁相與順磁相的共存,此外,高能量的激光對樣品的電阻變化影響更明顯。進(jìn)一步研究表明,Ce的摻雜濃度將會通過金屬-絕緣相變對La1-xCexMnO3的磁電阻效應(yīng)產(chǎn)生顯著的調(diào)制作用。本文將為新型能量轉(zhuǎn)換器件的開發(fā)與應(yīng)用提供新的研究思路。"/>

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不同Ce摻雜比例對La1-xCexMnO3薄膜輸運(yùn)性質(zhì)及機(jī)理研究
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西北工業(yè)大學(xué),西北工業(yè)大學(xué),西北工業(yè)大學(xué),西北工業(yè)大學(xué)

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國家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)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:

    本文中研究了電子型摻雜鈣鈦礦薄膜La1-xCexMnO3的輸運(yùn)性質(zhì)和外場作用下的輸運(yùn)機(jī)理。研究表明,La1-xCexMnO3薄膜呈現(xiàn)出典型的金屬-絕緣體轉(zhuǎn)變,且與Ce的摻雜濃度相關(guān)。電阻溫度曲線表明,在低溫時(shí),電子-電子散射和磁疇對電子的散射是電阻形成的主要原因,而在高溫下小極化子的跳躍機(jī)制起主要貢獻(xiàn)。通過激光照射樣品表面,發(fā)現(xiàn)光場誘導(dǎo)金屬絕緣體轉(zhuǎn)變溫度向著低溫區(qū)間偏移,該現(xiàn)象產(chǎn)生的原因在于La1-xCexMnO3薄膜內(nèi)部鐵磁相與順磁相的共存,此外,高能量的激光對樣品的電阻變化影響更明顯。進(jìn)一步研究表明,Ce的摻雜濃度將會通過金屬-絕緣相變對La1-xCexMnO3的磁電阻效應(yīng)產(chǎn)生顯著的調(diào)制作用。本文將為新型能量轉(zhuǎn)換器件的開發(fā)與應(yīng)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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牛利偉,陳長樂,王建元,金克新.不同Ce摻雜比例對La1-xCexMnO3薄膜輸運(yùn)性質(zhì)及機(jī)理研究[J].稀有金屬材料與工程,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
  • 錄用日期:2017-10-10
  • 在線發(fā)布日期: 2018-03-15
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