Oxidation of reduced polycrystalline Nb-doped SrTiO3: Characterization of surface islands

Rahmati, B.; Fleig, Jürgen; Sigle, Wilfried; Bischoff, E.; Maier, Joachim; Rühle, M.

doi:10.1016/j.susc.2005.07.041

Cited by 30 publications

(21 citation statements)

References 19 publications

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“…Szot et al have observed a continuous accumulation of SrO x on SrTiO 3 (100) surfaces in the case of oxidizing conditions [411,412]. Sr surface segregation and growth of SrO x secondary phase on SrTiO 3 surfaces under oxidizing conditions have been also confirmed by many groups [407,[413][414][415][416][417][418]. The amount of the formed surface SrO x layers increases with the doping level of La or Nb in SrTiO 3 since the extrinsic donors can create more Sr vacancies and enhance Sr diffusion in the solids [413][414][415].…”

Section: Effect Of Srtiomentioning

confidence: 80%

Interaction of nanostructured metal overlayers with oxide surfaces

Wagner

2007

Surface Science Reports

726

651

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Section: Effect Of Srtiomentioning

confidence: 80%

Interaction of nanostructured metal overlayers with oxide surfaces

Wagner

2007

Surface Science Reports

726

651

View full text Add to dashboard Cite

“…2(b) -(d) with the grain orientations as determined from Fig. 3 we may plot the core-level signal intensities in a stereographic projection as a function of the grain orientation following the procedure already established by Rahmati et al [13] Fig. 4(a) shows the principal directions in the stereographic plot.…”

Section: Resultsmentioning

confidence: 99%

“…[12] When considering polycrystalline ceramic samples the situation is even more complex, since we are in the presence of a multitude of different single-crystal orientations; each with the same lattice parameter and bulk stoichiometry. However, as Rahmati et al [13] have demonstrated, the grain orien-tation can be a decisive factor in, e.g. Sr-rich island growth, and in the structure of these islands.…”

Section: Introductionmentioning

confidence: 99%

Orientation‐dependent surface composition of in situ annealed strontium titanate

Zagonel

Barrett

Renault

et al. 2008

Surface & Interface Analysis

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The surface composition of polycrystalline niobium-doped strontium titanate (SrTiO 3 : Nb) is studied using X-ray photoelectron emission microscopy (XPEEM) for many grain orientations in order to characterise the surface chemistry with high spatial resolution. The surface sensitivity is maximised by the use of soft X-ray synchrotron radiation (SR). The grain orientation is determined by electron backscattering diffraction (EBSD). Stereographic plots are used to show the correlation between surface composition and orientation for several grains. Predominant surface terminations are assigned to major orientations.

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“…In n-type STO, strontium vacancy defects are the dominant ionic defect species, increasingly incorporated upon oxidation, as extensively discussed in the literature [53,54,[56][57][58][59][60][61]. Sr vacancies are typically induced via the partial Schottky equilibrium, which is equivalent to the formation of SrO in an oxidizing atmosphere leaving behind a vacant strontium lattice site [53,62].…”

Section: ••mentioning

confidence: 99%

Defect Control of Conventional and Anomalous Electron Transport at Complex Oxide Interfaces

et al. 2016

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Using low-temperature electrical measurements, the interrelation between electron transport, magnetic properties, and ionic defect structure in complex oxide interface systems is investigated, focusing on NdGaO 3 =SrTiO 3 (100) interfaces. Field-dependent Hall characteristics (2-300 K) are obtained for samples grown at various growth pressures. In addition to multiple electron transport, interfacial magnetism is tracked exploiting the anomalous Hall effect (AHE). These two properties both contribute to a nonlinearity in the field dependence of the Hall resistance, with multiple carrier conduction evident below 30 K and AHE at temperatures ≲10 K. Considering these two sources of nonlinearity, we suggest a phenomenological model capturing the complex field dependence of the Hall characteristics in the low-temperature regime. Our model allows the extraction of the conventional transport parameters and a qualitative analysis of the magnetization. The electron mobility is found to decrease systematically with increasing growth pressure. This suggests dominant electron scattering by acceptor-type strontium vacancies incorporated during growth. The AHE scales with growth pressure. The most pronounced AHE is found at increased growth pressure and, thus, in the most defective, low-mobility samples, indicating a correlation between transport, magnetism, and cation defect concentration.

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Oxidation of reduced polycrystalline Nb-doped SrTiO3: Characterization of surface islands

Cited by 30 publications

References 19 publications

Interaction of nanostructured metal overlayers with oxide surfaces

Interaction of nanostructured metal overlayers with oxide surfaces

Orientation‐dependent surface composition of in situ annealed strontium titanate

Defect Control of Conventional and Anomalous Electron Transport at Complex Oxide Interfaces

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