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Tensile strain induced changes in the optical spectra of SrTiO₃ epitaxial thin films

Dejneka A.¹, Tyunina M.², Narkilahti J.², Levoska J.², Chvostova D.¹, Jastrabik L.¹, Trepakov V.A.^1,3

¹Institute of Physics AS CR, Praha, Czech Republic
²Microelectronics and Materials Physics Laboratories, University of Oulu, Oulu, Finland
³A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia Ioffe Institute, St. Petersburg, Russia

Email: dejneka@fzu.cz

Поступила в редакцию: 22 декабря 2009 г.

Выставление онлайн: 19 сентября 2010 г.

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Effect of biaxial tensile strains on optical function and band edge transitions of ultra thin epitaxial films was studied using as an example a 13 nm thick SrTiO₃ films deposited on KTaO₃ (100) single-crystal substrates. Optical functions in the 200-1200 nm spectral range were determined by spectroscopic ellipsometry technique. It was found that tensile strains result in a shift of the low energy band gap optical transitions to higher energies and decrease the refractive index in the visible region. Comparison of the optical spectra for strained SrTiO₃ films and for homoepitaxial strain-free SrTiO₃ : Cr (0.01 at.%) films deposited on SrTiO₃ (100) single crystalline substrates showed that this "blue" shift of the band gap could not be related to technological imperfections or to reduced thickness. The observed effect is connected with changes in the lowest conduction and in the top valence bands that are due to increase of the in-plane lattice constant and/or onset of the polar phase in the tensile strain-induced ultra-thin epitaxial SrTiO₃ films. This work was supported by Grants 1M06002 of MSMT v CR, KAN 301370701, and AV0Z10100522 of AV v CR, GACR 202/08/1009, Academy of Finland (N 118250), Sc. Sch.-4587.2010.2, and Program of Presidium RAS "Quantum phys. of condensed matter".

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