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In situ investigation of the early stage of TiO(2) epitaxy on (001) SrTiO(3) (Articolo in rivista)

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In situ investigation of the early stage of TiO(2) epitaxy on (001) SrTiO(3) (Articolo in rivista) (literal)

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Radovic, M; Salluzzo, M; Ristic, Z; Di Capua, R; Lampis, N; Vaglio, R; Granozio, FM (2011)
In situ investigation of the early stage of TiO(2) epitaxy on (001) SrTiO(3)
in The Journal of chemical physics; Acoustical Society Of America, American Institute Of Physics, Melville (Stati Uniti d'America)
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Radovic, M; Salluzzo, M; Ristic, Z; Di Capua, R; Lampis, N; Vaglio, R; Granozio, FM (literal)

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M. Radovic,1,2; M. Salluzzo,2,3; Z. Ristic,2,4; R. Di Capua,2,5; N. Lampis,2,6; R. Vaglio,2,3; and F. Miletto Granozio 2,3 1 LSNS - EPFL, PH A2 354 (Bâtiment PH) Station 3 CH-1015 Lausanne, Switzerland 2 CNR-SPIN, Complesso Universitario Monte S. Angelo, Via Cintia I-80126 Napoli, Italy 3 Dipartimento di Fisica, Università \"Federico II\" di Napoli, Piazzale Tecchio, I-80126, Italy 4 Département de Physique de la Matière Condensée, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland 5 Dipartimento S.pe.S., Università degli Studi del Molise - Via De Sanctis, I-86100 Campobasso, Italy 6 Laborvetro srl, via Calamattia 6, I-09134 Cagliari, Italy (literal)

Titolo

In situ investigation of the early stage of TiO(2) epitaxy on (001) SrTiO(3) (literal)

Abstract

We report on a systematic study of the growth of epitaxial TiO2 films deposited by pulsed laser deposition on Ti-terminated SrTiO3 (001) single crystals. By using in situ reflection high energy electron diffraction, low energy electron diffraction, x-ray photoemission spectroscopy, and scanning probe microscopy, we show that the stabilization of the anatase (001) phase is preceded by the growth of a few nanometers thick pseudomorphic SrxTiO2+y (x, y < 1) intermediate layer. The data demonstrate that the formation of this intermediate phase is related to the activation of a long range Sr migration from the SrTiO3 substrate into the film. Our results enrich the phase diagram of the Sr-Ti-O system under epitaxial strain opening a route for the study of the electronic and dielectric properties of the reported Sr-deficient SrTiO3 phase. (literal)

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