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arXiv 1111.5047cond-mat.mtrl-scicond-mat.mes-hall
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溅射沉积制备的LaAlO/SrTiO3界面的导电性

Conductivity of LaAlO/SrTiO3 Interfaces made by Sputter Deposition

I. M. Dildar, D. B. Boltje, M. H. S. Hesselberth, Q. Xu, H. W. Zandbergen, S. Harkema

摘要:

我们研究了生长在SrTiO_3衬底上的LaAl_3薄膜的界面性质。我们在高压氧气气氛中使用RF溅射。膜是光滑的,具有平坦表面。透射电子显微镜显示原子尖锐和连续的界面,而EELS测量显示一些轻微的混合。用EDX法测得La与Al的元素比为1.07。重要的是,我们发现这些接口是不导电的,这表明溅射的接口是不电子重建的方式报告的脉冲激光沉积生长的薄膜,因为化学计量,混合和氧空位之间的不同的相互作用。

英文摘要:

We have investigated the properties of interfaces between LaAlO3 films grown on SrTiO3 substrates singly terminated by TiO2. We used RF sputtering in a high-pressure oxygen atmosphere. The films are smooth, with flat surfaces. Transmission Electron Microscopy shows atomically sharp and continuous interfaces while EELS measurements show some slight intermixing. The elemental ratio of La to Al measured by EDX is found to be 1.07. Importantly, we find these interfaces to be non-conducting, indicating that the sputtered interface is not electronically reconstructed in the way reported for films grown by Pulsed Laser Deposition because of the different interplay between stoichiometry, mixing and oxygen vacancies.

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