Epitaxial growth of perovskite oxide films facilitated by oxygen vacancies

The authors would like to thank P. Yudin for valuable discussions, N. Nepomniashchaia for VASE studies, and S. Cichon for XPS analysis. The authors acknowledge support from the Czech Science Foundation (Grant No. 19-09671S), the European Structural and Investment Funds and the Ministry of Education, Youth and Sports of the Czech Republic through Programme ‘‘Research, Development and Education’’ (Project No. SOLID21 CZ.02.1.01/0.0/0.0/16-019/0000760), and ERA NET project Sun2Chem (E. K. and L. R.). Calculations have been done on the LASC Cluster in the ISSP UL.Single-crystal epitaxial films of technologically important and scientifically intriguing multifunctional ABO3 perovskite-type metal oxides are essential for advanced applications and understanding of these materials. In such films, a film-substrate misfit strain enables unprecedented crystal phases and unique properties that are not available in their bulk counterparts. However, the prerequisite growth of strained epitaxial films is fundamentally restricted by misfit relaxation. Here we demonstrate that introduction of a small oxygen deficiency concurrently stabilizes epitaxy and increases lattice strain in thin films of archetypal perovskite oxide SrTiO3. By combining experimental and theoretical methods, we found that lattice distortions around oxygen vacancies lead to anisotropic local stresses, which interact with the misfit strain in epitaxial films. Consequently, specific crystallographic alignments of the stresses are energetically favorable and can facilitate epitaxial growth of strained films. Because anisotropic oxygen-vacancy stresses are inherent to perovskite-type and many other oxides, we anticipate that the disclosed phenomenon of epitaxial stabilization by oxygen vacancies is relevant for a very broad range of functional oxides.This work is licensed under CC BY, CC BY-NC licenses.Czech Science Foundation (Grant No. 19-09671S); European Structural and Investment Funds and the Ministry of Education, Youth and Sports of the Czech Republic through Programme ‘‘Research, Development and Education’’ (Project No. SOLID21 CZ.02.1.01/0.0/0.0/16-019/0000760), and ERA NET project Sun2Chem; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART²

Arbetsflöden med distribuerad versionshantering

This bachelor thesis focuses on distributed version control systems and workflows used when working with such systems. The thesis will investigate benefits and disadvantages in using distributed version control in software development using a literature review of the available articles on the subject as well as a post-mortem analysis (with questionnaires and data collected from the build environment) of a student run software engineering project. We find that the migration costs are high, but that the advantages may outweigh its drawbacks for some. We conclude that many projects would benefit from migrating, but in particular, that new projects would not only benefit, but also not have high migration costs.En undersökning om hur man kan arbeta med moderna, distribuerade, versionshanteringssystem. Baserat på dels en literaturstudie, och dels en frågeundersökning bland studenter på BTH dras slutsatsen att det både finns för- och nackdelar, men att fördelarna verkar väga över i det generella fallet.Jag (Olof Johansson) är nåbar främst per e-post, men även på telefonnummer +46739467135

Arbetsflöden med distribuerad versionshantering

This bachelor thesis focuses on distributed version control systems and workflows used when working with such systems. The thesis will investigate benefits and disadvantages in using distributed version control in software development using a literature review of the available articles on the subject as well as a post-mortem analysis (with questionnaires and data collected from the build environment) of a student run software engineering project. We find that the migration costs are high, but that the advantages may outweigh its drawbacks for some. We conclude that many projects would benefit from migrating, but in particular, that new projects would not only benefit, but also not have high migration costs.En undersökning om hur man kan arbeta med moderna, distribuerade, versionshanteringssystem. Baserat på dels en literaturstudie, och dels en frågeundersökning bland studenter på BTH dras slutsatsen att det både finns för- och nackdelar, men att fördelarna verkar väga över i det generella fallet.Jag (Olof Johansson) är nåbar främst per e-post, men även på telefonnummer +46739467135

Fourier coefficients attached to small automorphic representations of SLn(A)

We show that Fourier coefficients of automorphic forms attached to minimal or next-to-minimal automorphic representations of SLn(A) are completely determined by certain highly degenerate Whittaker coefficients. We give an explicit formula for the Fourier expansion, analogously to the Piatetski-Shapiro–Shalika formula. In addition, we derive expressions for Fourier coefficients associated to all maximal parabolic subgroups. These results have potential applications for scattering amplitudes in string theory.SCOPUS: ar.jDecretOANoAutActifinfo:eu-repo/semantics/publishe