V. B. Shirokov, Yu. I. Golovko, V. M. Mukhortov, Yu. V. Revinskii, “Optical properties of the Ba$_{0.8}$Sr$_{0.2}$TiO$_3$/(Bi$_{0.82}$,Nd$_{0.02}$)FeO$_3$ superlattice”, Zhurnal Tekhnicheskoi Fiziki, 2014, Volume 84, Issue 4,Pages 104

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Optics

Optical properties of the Ba$_{0.8}$Sr$_{0.2}$TiO$_3$/(Bi$_{0.82}$,Nd$_{0.02}$)FeO$_3$ superlattice

V. B. Shirokov^ab, Yu. I. Golovko^a, V. M. Mukhortov^ab, Yu. V. Revinskii^a

^a Southern Research Center of the Russian Academy of Sciences, Rostov-on-Don
^b Southern Federal University, Rostov-on-Don

Abstract: A Ba$_{0.8}$Sr$_{0.2}$TiO$_3$/(Bi$_{0.82}$,Nd$_{0.02}$)FeO$_3$ multilayer heteroepitaxial structure is prepared by successively depositing 20 Ba$_{0.8}$Sr$_{0.2}$TiO$_3$ and (Bi$_{0.82}$,Nd$_{0.02}$)FeO$_3$ layers, each 4 nm thick, using the method of rf sputtering. The layers grow on a single-crystal MgO substrate following the layer-by-layer mechanism. The structural perfection of the layers is examined by X-ray diffraction. The optical transmission is studied in the wavelength interval 200–1100 nm. The spectra are processed using a dispersion formula for the permittivity represented as a superposition of two oscillators with regard to relaxation. Such an approach allows us to separate direct and indirect transitions. The absorption edge of the superlattice for direct transitions is 80 nm wide and is estimated to be 3.78 eV.

Received: 12.07.2013