Study of SrO segregation on SrTiO3(100) surfaces

Han, Wei; Beuermann, L.; Helmbold, J.; Borchardt, G.; Kempter, V.; Lilienkamp, G.; Maus‐Friedrichs, W.

doi:10.1016/s0955-2219(01)00091-7

Cited by 45 publications

(28 citation statements)

References 12 publications

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“…11 In addition, Mikheev et al attributed the magnitude of the resistive switching properties of a Pt/Nb:SrTiO 3 junction to charges trapped in an unintentional contamination layer. 4 [14][15][16][17] A comparable scenario has been proposed also for electron gases formed at interfaces of SrTiO 3 . [18][19][20] Classical defect chemistry of donor-doped bulk SrTiO 3 is generally accepted for elevated temperatures above 1200 K. 21 At lower temperatures, however, it might not be possible to equilibrate either of the ionic sublattices in the entire sample due to sluggish ionic movement.…”

Section: All Article Content Except Where Otherwise Noted Is Licensmentioning

confidence: 64%

Oxygen partial pressure dependence of surface space charge formation in donor-doped SrTiO₃

Andrä

Dvořák²,

Vorokhta³

et al. 2017

APL Materials

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Section: All Article Content Except Where Otherwise Noted Is Licensmentioning

confidence: 64%

Oxygen partial pressure dependence of surface space charge formation in donor-doped SrTiO₃

Andrä

Dvořák²,

Vorokhta³

et al. 2017

APL Materials

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“…Liang and Bonnell [25,29] have shown that annealing SrTiO 3 in UHV at 1300°C gives rise to SrO island formation on the surface. Wei et al [32] annealed SrTiO 3 in an ambient atmosphere at 1300°C and showed that this gives rise to SrO island formation on the surface. Szot and coworkers [33,34] have performed some very elegant atomic force microscopy of the SrO islands on the SrTiO 3 (0 0 1) surface.…”

Section: Discussionmentioning

confidence: 99%

Nanostructures on the SrTiO3() surface studied by STM

2002

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Atomic resolution scanning tunnelling microscopy of the SrTiO 3 (0 0 1) surface reveals that certain treatments give rise to two types of self-assembled nanostructures. Surfaces prepared through Ar ion sputtering and ultrahigh vacuum (UHV) annealing up to 900°C form terraces with straight step edges that have a c(4 Â 2) reconstruction. Following further UHV annealing above 900°C nanolines of 1 nm width, 0.2 nm height, and variable length are created that run in h1 0 0i directions. On closest packing the nanolines are 2.4 nm apart and form a (6 Â 2) overlayer. On further annealing the nanolines break up into nanodots of 0.2 nm height that form regular arrays. It is proposed that both structure types are created through non-stoichiometry of the surface region that results in nanocrystalline growth of either SrO or TiO x . SrTiO 3 surfaces patterned in this way have the potential to serve as a template for the growth of metallic or semiconducting quantum structures.

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“…Thus, it is most likely that Ti atoms are more mobile with respect to heavy Sr atoms and tend to reorganize the surface under appropriate temperature and/or pressure conditions. Therefore, larger time is needed for formation of SrO islands due to agglomeration, 9 while TiO x islands disappear when annealing time is increased. 19 …”

Section: B Surface Stabilitymentioning

confidence: 99%

“…A large number of studies have been performed in recent years to understand and to determine a variety of SrTiO 3 surface structures realized under different experimental conditions. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Some of the reported experimental observations are summarized in Table I.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and thermodynamic stability of double-layeredSrTiO3(001)surfaces:Ab initiosimulations

et al. 2007

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Using the B3PW hybrid exchange-correlation functional within density-functional theory and employing Gaussian-type basis sets, we calculated the atomic and electronic structures and thermodynamic stability of three double-layered ͑DL͒ SrTiO 3 ͑001͒ surfaces: ͑i͒ SrO-terminated, ͑ii͒ TiO 2 -terminated, and ͑iii͒ ͑2 ϫ 1͒ reconstruction of TiO 2 -terminated SrTiO 3 ͑001͒ recently suggested by Erdman et al. ͓Nature ͑London͒ 419, 55 ͑2002͔͒. A thermodynamic stability diagram obtained from first-principles calculations shows that regular TiO 2 -and SrO-terminated surfaces are the most stable. The stability regions of ͑2 ϫ 1͒ DL TiO 2 -and DL SrO-terminated surfaces lie beyond the precipitation lines of SrO and TiO 2 compounds and thus are less stable with respect to regular SrTiO 3 ͑001͒ surfaces. Analysis of the stability diagram suggests that Sr precipitation on SrTiO 3 surface never occurs. Our simulations show a substantial increase of Ti-O covalency on the DL surfaces as compared to the regular surfaces, which are themselves more covalent than the crystalline bulk. The implications of our calculated results for recent experimental observations are discussed.

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Study of SrO segregation on SrTiO3(100) surfaces

Cited by 45 publications

References 12 publications

Oxygen partial pressure dependence of surface space charge formation in donor-doped SrTiO₃

Oxygen partial pressure dependence of surface space charge formation in donor-doped SrTiO₃

Nanostructures on the SrTiO3() surface studied by STM

Electronic structure and thermodynamic stability of double-layeredSrTiO3(001)surfaces:Ab initiosimulations

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Study of SrO segregation on SrTiO3(100) surfaces

Cited by 45 publications

References 12 publications

Oxygen partial pressure dependence of surface space charge formation in donor-doped SrTiO3

Oxygen partial pressure dependence of surface space charge formation in donor-doped SrTiO3

Nanostructures on the SrTiO3() surface studied by STM

Electronic structure and thermodynamic stability of double-layeredSrTiO3(001)surfaces:Ab initiosimulations

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Oxygen partial pressure dependence of surface space charge formation in donor-doped SrTiO₃

Oxygen partial pressure dependence of surface space charge formation in donor-doped SrTiO₃