Chin. Phys. Lett.  2016, Vol. 33 Issue (07): 076801    DOI: 10.1088/0256-307X/33/7/076801
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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
1Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2Collaborative Innovation Center of Quantum Matter, Beijing 100190
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Ya-Qing Feng, Kui-Juan Jin, Chen Ge et al  2016 Chin. Phys. Lett. 33 076801
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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.
Received: 21 March 2016      Published: 01 August 2016
PACS:  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))  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/33/7/076801       OR      https://cpl.iphy.ac.cn/Y2016/V33/I07/076801
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Ya-Qing Feng
Kui-Juan Jin
Chen Ge
Xu He
Lin Gu
Zhen-Zhong Yang
Hai-Zhong Guo
Qian Wan
Meng He
Hui-Bin Lu
Guo-Zhen Yang
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