Microstructural investigation of La2Ti2O7 thin films grown by MBE

Jeongwoo Seo; J. Fompeyrine; Jean-Pierre Locquet

doi:10.1117/12.335903

22 December 1998 Microstructural investigation of La₂Ti₂O₇ thin films grown by MBE

Jeongwoo Seo, J. Fompeyrine, Jean-Pierre Locquet

Proceedings Volume 3481, Superconducting and Related Oxides: Physics and Nanoengineering III; (1998) https://doi.org/10.1117/12.335903
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

In the La-Ti-O system many phases with different structures exist depending on the actual oxygen content. Starting from LaTiO₃, which has an orthorhombic unit cell, to the monoclinic La₂Ti₂O₇ structure, first semiconducting, then metallic and finally ferroelectric characteristics can be obtained at room temperature. Recent transmission electron microscopy studies of the bulk materials showed that the transformation of the LaTiO₃ structure to La₂Ti₂O₇ is based on the insertion of an additional oxygen plane in the {110} perovskite planes. A controlled insertion of this oxygen plane would allow heterostructures to be grown that exhibit different physical properties but have perfect chemical compatibility. Here, we report on our results of epitaxially grown thin films of La₂Ti₂O₇ on (110)-oriented SrTiO₃ and LaAlO₃ substrates using sequential deposition of La and Ti under a beam of atomic oxygen. The epitaxial behavior and the microstructural properties of these films were investigated by transmission electron microscopy.

Citation Download Citation

Jeongwoo Seo, J. Fompeyrine, and Jean-Pierre Locquet "Microstructural investigation of La₂Ti₂O₇ thin films grown by MBE", Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); https://doi.org/10.1117/12.335903

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