Epitaxially stabilized growth of orthorhombic LuScO3 thin films

Heeg, T. ; Roeckerath, M. ; Schubert, J. ; Zander, W. ; Buchal, Ch. ; Chen, H. Y. ; Jia, C. L. ; Jia, Y. ; Adamo, C. ; Schlom, D. G.

2007

Abstract: Metastable lutetium scandate (LuScO3) thin films with an orthorhombic perovskite structure have been prepared by molecular-beam epitaxy and pulsed-laser deposition on NdGaO3(110) and DyScO3(110) substrates. Stoichiometry and crystallinity were investigated using Rutherford backscattering spectrometry/channeling, x-ray diffraction, and transmission electron microscopy. The results indicate that LuScO3, which normally only exists as a solid solution of Sc2O3 and Lu2O3 with the cubic bixbyite structure, can be grown in the orthorhombically distorted perovskite structure. Rocking curves as narrow as 0.05deg were achieved. A critical film thickness of approximately 200 nm for the epitaxially stabilized perovskite polymorph of LuScO3 on NdGaO3(110) substrates was determined.

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