Epitaxial growth process of La0.7Ca0.3MnO3 thin films on SrTiO3(001): Thickness-dependent inhomogeneity caused by excess Ti atoms

Ryota Shimizu; Takeo Ohsawa; Katsuya Iwaya; Susumu Shiraki; Taro Hitosugi

doi:10.1021/cg4013119

Epitaxial growth process of La_0.7Ca_0.3MnO₃ thin films on SrTiO₃(001): Thickness-dependent inhomogeneity caused by excess Ti atoms

Ryota Shimizu, Takeo Ohsawa, Katsuya Iwaya, Susumu Shiraki, Taro Hitosugi

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

We report on the thickness-dependent incorporation of excess Ti atoms into La_0.7Ca_0.3MnO₃ thin films epitaxially grown on SrTiO₃(001) substrates. Using the atomically defined SrTiO ₃(001)-(√13 × √13)-R33.7° substrate, the topmost surface of which is covered with excess TiO₂ layer, we atomically image a gradual transition of the surface structures from (√13 × √13)-R33.7° to pseudocubic (1 × 1) periodicities, as the film thickness is increased. Our results indicate that the initial excess Ti cations on the substrate surface are dispersed into the film, and displace Mn atoms onto the MnO₂-terminated film surface. Furthermore, the excess cations prefer segregation onto the film surface rather than uniform distribution inside the film. These findings indicate that more attention should be paid to the influence of the substrate surface on the film stoichiometry, and its implications for the physical properties of thin manganite films.

Original language	English
Pages (from-to)	1555-1560
Number of pages	6
Journal	Crystal Growth and Design
Volume	14
Issue number	4
DOIs	https://doi.org/10.1021/cg4013119
Publication status	Published - 2014 Apr 2

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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title = "Epitaxial growth process of La0.7Ca0.3MnO3 thin films on SrTiO3(001): Thickness-dependent inhomogeneity caused by excess Ti atoms",

abstract = "We report on the thickness-dependent incorporation of excess Ti atoms into La0.7Ca0.3MnO3 thin films epitaxially grown on SrTiO3(001) substrates. Using the atomically defined SrTiO 3(001)-(√13 × √13)-R33.7° substrate, the topmost surface of which is covered with excess TiO2 layer, we atomically image a gradual transition of the surface structures from (√13 × √13)-R33.7° to pseudocubic (1 × 1) periodicities, as the film thickness is increased. Our results indicate that the initial excess Ti cations on the substrate surface are dispersed into the film, and displace Mn atoms onto the MnO2-terminated film surface. Furthermore, the excess cations prefer segregation onto the film surface rather than uniform distribution inside the film. These findings indicate that more attention should be paid to the influence of the substrate surface on the film stoichiometry, and its implications for the physical properties of thin manganite films.",

author = "Ryota Shimizu and Takeo Ohsawa and Katsuya Iwaya and Susumu Shiraki and Taro Hitosugi",

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T1 - Epitaxial growth process of La0.7Ca0.3MnO3 thin films on SrTiO3(001)

T2 - Thickness-dependent inhomogeneity caused by excess Ti atoms

AU - Shimizu, Ryota

AU - Ohsawa, Takeo

AU - Iwaya, Katsuya

AU - Shiraki, Susumu

AU - Hitosugi, Taro

PY - 2014/4/2

Y1 - 2014/4/2

N2 - We report on the thickness-dependent incorporation of excess Ti atoms into La0.7Ca0.3MnO3 thin films epitaxially grown on SrTiO3(001) substrates. Using the atomically defined SrTiO 3(001)-(√13 × √13)-R33.7° substrate, the topmost surface of which is covered with excess TiO2 layer, we atomically image a gradual transition of the surface structures from (√13 × √13)-R33.7° to pseudocubic (1 × 1) periodicities, as the film thickness is increased. Our results indicate that the initial excess Ti cations on the substrate surface are dispersed into the film, and displace Mn atoms onto the MnO2-terminated film surface. Furthermore, the excess cations prefer segregation onto the film surface rather than uniform distribution inside the film. These findings indicate that more attention should be paid to the influence of the substrate surface on the film stoichiometry, and its implications for the physical properties of thin manganite films.

AB - We report on the thickness-dependent incorporation of excess Ti atoms into La0.7Ca0.3MnO3 thin films epitaxially grown on SrTiO3(001) substrates. Using the atomically defined SrTiO 3(001)-(√13 × √13)-R33.7° substrate, the topmost surface of which is covered with excess TiO2 layer, we atomically image a gradual transition of the surface structures from (√13 × √13)-R33.7° to pseudocubic (1 × 1) periodicities, as the film thickness is increased. Our results indicate that the initial excess Ti cations on the substrate surface are dispersed into the film, and displace Mn atoms onto the MnO2-terminated film surface. Furthermore, the excess cations prefer segregation onto the film surface rather than uniform distribution inside the film. These findings indicate that more attention should be paid to the influence of the substrate surface on the film stoichiometry, and its implications for the physical properties of thin manganite films.

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Epitaxial growth process of La_0.7Ca_0.3MnO₃ thin films on SrTiO₃(001): Thickness-dependent inhomogeneity caused by excess Ti atoms

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