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研究了对靶溅射技术制备的La0.67Ca0.33MnO3/La0.67Sr0.33CoO3/La0.67Ca0.33MnO3三层薄膜中的磁输运特性。由于La0.67Sr0.33CoO3层的电阻短路效应,三层膜的磁阻随中间层厚度的增加而迅速减小。与La0.67Ca0.33MnO3单层膜不同,三层膜显示出增强的金属-绝缘体转变温度(TMS)。在230K时,系统的矫顽力Hc随中间层厚度非单调地变化,磁滞回线的形状表明了两层La0.67Ca0.33MnO3之间存在着磁性耦合。 相似文献
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本文用对靶溅射技术制备了La2/3Ca1/3MnO3/YBa2Cu4O8/La2/3Ca1/3MnO3薄膜.与YBCO单层薄膜相比,由于超导/铁磁系统中的磁性邻近效应,三层薄膜表现出较低的超导转变温度.薄膜的R~T测量曲线显示出超磁阻(CMR)效应和超导转变,预示着超导和铁磁特性共存于LCMO/YBCO/LCMO三文治结构. 相似文献
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采用对靶溅射技术制备了YBa2Cu4O8/La2/3Ca1/3MnO3/YBa2Cu4O8(Y-124/LCMO/Y-124)异质结, 研究了超导转变温度(TC)随LCMO层厚度(dL)的振荡行为. 当dL>dLCR时, TC-dL曲线表现出清晰的非单调行为, 而金属-绝缘体转变温度(TMI)仅当dL>dLCR时才能观测到. Y-124/LCMO/Y-124系统中所存在的这种对中间层的依赖关系, 显示了铁磁和超导耦合间强烈的相互作用. 相似文献
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研究了外延La0.67Ca0.33MnO3(LcMO)/SrTiO3(100)和LCMO/NdGaO3(110)(NGO)薄膜的电输运特性随薄膜厚度的变化。尽管LCMO/STO和LCMO/NGO表现出不同的晶格畸变,但是,研究发现,在结构与输运特性之间没有直接的依赖关系,表现晶格应变效应对薄膜的电输运特性没有影响,如电阻率、金属-半导体转变、极化子激发能。 相似文献
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The perovskite bilayers La0.67Ca0.33MnO3 (LCMO) (100 nm) / La0.67Sr0.33MnO3(LSMO) (100 nm) and LSMO (100 nm) / LCMO (100 nm) are fabricated by a facing-target sputtering technique. Their transport and magnetic properties are investigated. It is found that the transport properties between them are different obviously due to distinguishable structures, and the different lattice strains in both films result in the difference of metal-to-insulator transition. Only single-step magnetization loop appears in our bilayers from 5K to 320K, and the coercive force of LSMO/LCMO varies irregularly with a minimum ~ 2387A/m which is lower than that of LCMO and LSMO single layer films. The behaviour is explained by some magnetic coupling. 相似文献
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