Structural and optical properties of epitaxial BaTiO[sub 3] thin films grown on GdScO[sub 3](110)

Schubert, J.; Trithaveesak, O.; Petraru, A.; Jia, C. L.; Uecker, R.; Reiche, P.; Schlom, D. G.
May 2003
Applied Physics Letters;5/19/2003, Vol. 82 Issue 20, p3460
Academic Journal
We have prepared 1-µm-thick epitaxial BaTiO[sub 3] thin films on GdScO[sub 3](110) using pulsed laser deposition. The structural perfection of the films was revealed by a rocking curve width of Δω =0.13° for the 002 B aTiO[sub 3] reflection and a Rutherford backscattering spectrometry/channeling minimum yield, Χ[sub min], of 0.5% measured for the Ba signal behind the surface peak. High-resolution transmission electron microscopy revealed an epitaxial relationship between BaTiO[sub 3] and GdScO[sub 3] and a sharp interface between the substrate and the film. The refractive index of the BaTiO[sub 3] film was n[sub 0]=2.329±0.002 and n[sub e]=2.307±0.002 at a wavelength of 632.8 nm and n[sub 0]=2.248±0.002 and n[sub e]=2.228±0.002 at a wavelength of 1523 nm. The optical losses were less than 2 dB/cm at a wavelength of 632.8 nm.


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