Unexpected precipitates in conjunction with layer-by-layer growth in Mn-enriched La2/3Sr1/3MnO3 thin films

Steffen, Alexandra; Glavic, Artur; Gutberlet, Thomas; Ambaye, Haile; Schubert, J.; Geprägs, Stephan; Barthel, Juri; Mattauch, Stefan; Zander, W.; Kruth, Maximilian; Schöffmann, Patrick; Pütter, Sabine; Brückel, Thomas

doi:10.1016/j.tsf.2021.138862

Cited by 3 publications

(4 citation statements)

References 30 publications

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“…This is supported by the fact that similar clusters are observed aer depositing large amounts (more than z2 ML) of Mn and La on well-dened LSMO(110) surfaces followed by short annealing times (#20 min); and by the previously reported formation of MnO x precipitates in epitaxial LSMO(001) lms under Mn-rich conditions. 25 The 3D clusters form when the surface cannot accommodate the excess cations by modifying its atomic structure. It was already reported that Mn (La) species stick less on Mn(La)-richer surfaces.…”

Section: Discussionmentioning

confidence: 99%

“…This is supported by the fact that similar clusters are observed after depositing large amounts (more than ≈2 ML) of Mn and La on well-defined LSMO(110) surfaces followed by short annealing times (≤20 min); and by the previously reported formation of MnO x precipitates in epitaxial LSMO(001) films under Mn-rich conditions. 25 …”

Section: Discussionmentioning

confidence: 99%

“…16,[18][19][20][21][22][23][24] Crystalline precipitates during nonstoichiometric growth are common. 25,26 The causes for morphological roughening are numerous and intertwined. In the simple case of one-component lms, deposition rate, energetics, attachment kinetics at step edges, mechanical stress, angle dependent rate, capillarity, viscous ow, and nucleation are known to be relevant.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of the surface atomic structure of multielement oxide films: curse or blessing?

Franceschi,

Heller,

Schmid

et al. 2023

Nanoscale Adv.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evolution of the surface atomic structure of multielement oxide films: curse or blessing?

Franceschi,

Heller,

Schmid

et al. 2023

Nanoscale Adv.

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show abstract

“…In the present study, YSZ and LSM are presumed having cubic lattice structure and their lattice constant are taken as 5.2 Å and 3.87 Å, respectively. 79,80 Furthermore, to solve Allen-Cahn equation, Dirichlet boundary conditions, η = 1 at the left boundary and η = 0 at the right boundary are used whereas zero flux condition is assumed to solve modified diffusion equation, equation 19 at both the boundaries for each cation similar to our previous study. 1 Further, the diffusion equation (equation 19) and Allen-Cahn equation 35 are non-dimensionalized using the following scaling parameterswhere ∆ l represents the characteristic length scale, and is taken as 3 nm similar to our previous study.…”

Section: Ionic Transport At Electrode-electrolyte Interfacementioning

confidence: 99%

Combined effect of temperature difference across interface and finite size of the ions on interdiffusion in SOFC

Kumar

Chakraborty

Das

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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In the present study, the combined effect of the temperature difference across the electrode-electrolyte interface and the finite size of ions non-idealities on the cation interdiffusion is investigated using a mathematical model. Here, we build on and add significantly to our previous work 1 where the study was limited only to the finite effect of ions. Considering each non-ideality/effect separately, the diffusion of manganese (Mn3+) ions decreases about 50 nm for a temperature difference (∆ T) of 50 K, and 31 nm for a finite size parameter ( ν) of 1.826. However, it is decreased by 54 nm considering both effects combindly for ∆ T = 50 K and ν = 1.75. Further, under individual effects, the highest electric potential drop is 0.32 for a ∆ T = 50 K and 0.27 for a ν = 1.75. Under combined effects, the electric potential drop is about 0.85 for ∆ T = 50 K and ν = 1.75. A significant variation is observed in the diffusion of Zr4+, Y3+ and Mn3+ ions and the overall electric potential. It is anticipated that the consideration of these effects/non-idealities will help in the better understanding of cation interdiffusion, and contribute towards performance enhancement of SOFCs.

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Effect of Mn concentration on the polar optical phonons frequencies in Cd1− xMnxTe thin films

Soares,

Rodrigues,

Moura

et al. 2023

Applied Physics Letters

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Cd1−xMnxTe (CMT) is a wide bandgap semiconductor that stands out among the ternary compounds in several industrial applications, such as optoelectronic and solar cell devices. Therefore, it is worth understanding the mechanisms of light interaction with CMT produced by growth techniques. In this work, we investigate the room temperature Raman scattering by longitudinal optical phonon modes CdTe-like (LO1) and MnTe-like (LO2) in CMT thin films grown on Si(111) by molecular-beam epitaxy. The well-known linear dependence of LO1 and LO2 frequencies on x is observed in Raman spectra when the excitation photon energy is above the bandgap energy. As expected, for the excitation energy of the incident laser line near the fundamental gap of CMT, the resonance becomes evident in the Raman results. However, for a specific resonance condition due to tuning of the bandgap energy dependence on Mn concentration, the frequencies of the LO1 and LO2 phonon modes remain constant as the average manganese concentration increases to values x≳ 0.30. From micro-photoluminescence spectroscopy investigations, we concluded that for Mn concentration above 0.3, a broad range of optical transitions provides the required conditions for a resonant Raman scattering selected by the incident photon energy. It introduces a resonant selectivity of regions where the incident excitation energy coincides with a bandgap energy associated with a specific value of x, even for samples with nominally different compositions. The results show the sensitivity of resonant Raman to express diagnostics of ternary compound growth.

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Unexpected precipitates in conjunction with layer-by-layer growth in Mn-enriched La2/3Sr1/3MnO3 thin films

Cited by 3 publications

References 30 publications

Evolution of the surface atomic structure of multielement oxide films: curse or blessing?

Evolution of the surface atomic structure of multielement oxide films: curse or blessing?

Combined effect of temperature difference across interface and finite size of the ions on interdiffusion in SOFC

Effect of Mn concentration on the polar optical phonons frequencies in Cd1− xMnxTe thin films

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