Effect of Terraces at the Interface on the Structural and Physical Properties of La$_{0.8}$Sr$_{0.2}$MnO$_{3}$ Thin Films
Ya-Qing Feng1 , Kui-Juan Jin1,2** , Chen Ge1 , Xu He1 , Lin Gu1 , Zhen-Zhong Yang1 , Hai-Zhong Guo1 , Qian Wan1 , Meng He1 , Hui-Bin Lu1 , Guo-Zhen Yang1,2
1 Institute of Physics, Chinese Academy of Sciences, Beijing 1001902 Collaborative Innovation Center of Quantum Matter, Beijing 100190
Abstract ：Employing atomic force microscopy, transmission electron microscopy and the second harmonic generation technique, we carefully explore the structural properties of 6-unit-cell-thick La$_{0.8}$Sr$_{0.2}$MnO$_{3}$ films grown on SrTiO$_{3}$ with atomically flat TiO$_{2}$-terminated terraces on the surface. The results clearly demonstrate that the terraces on the surface of TiO$_{2}$-terminated SrTiO$_{3}$ can improve the layer-by-layer epitaxial growth of the manganite films, which results in uniform film coverage at the beginning of growth and thus reduces the substrate-induced disorder at or near the interface. Comparing the magnetic and transport properties of La$_{0.8}$Sr$_{0.2}$MnO$_{3}$ films with the thicknesses varying from 6 unit cells to 80 unit cells grown respectively on as-received SrTiO$_{3}$ and TiO$_{2}$-terminated SrTiO$_{3}$, it is found that these atomically flat terraces on the surface of TiO$_{2}$-terminated SrTiO$_{3}$ can greatly enhance the Curie temperature and conductivities of the ultrathin La$_{0.8}$Sr$_{0.2}$MnO$_{3}$ films with thickness less than 50 unit cells, while no obvious difference is detected in the magnetic and transport properties of the 80 unit-cell thick films.
收稿日期: 2016-03-21
出版日期: 2016-08-01
:
68.35.Ct
(Interface structure and roughness)
75.75.-c
(Magnetic properties of nanostructures)
73.63.-b
(Electronic transport in nanoscale materials and structures)
68.37.Lp
(Transmission electron microscopy (TEM))
引用本文:
. [J]. 中国物理快报, 2016, 33(07): 76801-076801.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/33/7/076801
或
https://cpl.iphy.ac.cn/CN/Y2016/V33/I07/76801
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2016, Vol. 33 
