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iLaAlO3、MgO和SrTiO3襯底上的La0.7Sr0.3MnO3薄膜輸運和光誘導(dǎo)特性研究
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國家自然科學(xué)基金重點項目(50331040, 50702046); 2007年西北工業(yè)大學(xué)本科畢業(yè)設(shè)計(論文)重點扶持項目


Transport and Photoinduced Properties of La0.7Sr0.3MnO3 Thin Films Deposited on MgO, SrTiO3, and LaAlO3 Substrates
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    摘要:

    利用溶膠-凝膠(Sol-gel)法制備了La0.7Sr0.3MnO3（LSMO）靶材，并采用脈沖激光沉積(PLD)的方法在LaAlO3(100)、MgO(100)和SrTiO3(100) 襯底上沉積了外延薄膜，研究了襯底與薄膜之間的晶格不匹配度對LSMO薄膜輸運和光誘導(dǎo)特性的影響。結(jié)果表明：隨著晶格不匹配度（考慮符號）的增加，薄膜的相變溫度升高，而電阻率和光電導(dǎo)Δρ值則減小。在低溫金屬相，光誘導(dǎo)致使電阻率降低；高溫絕緣相光誘導(dǎo)則使得電阻率升高，在MgO和SrTiO3襯底上薄膜的光電導(dǎo)Δρ具有極大值和極小值，分析表明這一現(xiàn)象的出現(xiàn)可歸結(jié)于雙交換作用和極化子效應(yīng)。

    Abstract:

    La0.7Sr0.3MnO3 (LSMO) target has been prepared by sol-gel method and the thin films of LSMO have been deposited on LaAlO3, SrTiO3, MgO substrates using the pulsed laser deposition technique. The transport and photoinduced properties of LSMO thin films on different substrates have been investigated. It is found that the phase transition temperature decreases and the electrical resistivity increases with decreasing the lattice distortion degrees for the films. The photoinduced properties show that laser induces the increase of electrical resistivity in metallic phase, and the decreases of electrical resistivity in insulating phase. The photoinduced resistivities (Δρ) of films on the MgO and SrTiO3 substrates have a maximum and a minimum due to the competition of double exchange effect and polaron effect.

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譚興毅,金克新,趙省貴,陳長樂. iLaAlO3、MgO和SrTiO3襯底上的La0.7Sr0.3MnO3薄膜輸運和光誘導(dǎo)特性研究[J].稀有金屬材料與工程,2009,38(1):168~171.[Tan Xingyi, Jin Kexin, Zhao Shenggui, Chen Changle. Transport and Photoinduced Properties of La0.7Sr0.3MnO3 Thin Films Deposited on MgO, SrTiO3, and LaAlO3 Substrates[J]. Rare Metal Materials and Engineering,2009,38(1):168~171.]
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  • 收稿日期:2008-01-26
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