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• W3100674758 abstract "The class of antiperovskite compounds ${A}_{3}Bmathrm{O}$ ($A$ = Ca, Sr, Ba; $B$ = Sn, Pb) has attracted interest as a candidate three-dimensional Dirac system with topological surface states protected by crystal symmetry. A key factor underlying the rich electronic structure of ${A}_{3}Bmathrm{O}$ is the unusual valence state of $B$, i.e., a formal oxidation state of $ensuremath{-}4$. Practically, it is not obvious whether anionic $B$ can be stabilized in thin films, due to its unusual chemistry, as well as the polar surface of ${A}_{3}Bmathrm{O}$, which may render the growth-front surface unstable. We report x-ray photoelectron spectroscopy measurements of single-crystalline films of ${mathrm{Sr}}_{3}mathrm{SnO}$ and ${mathrm{Sr}}_{3}mathrm{PbO}$ grown by molecular beam epitaxy. We observe shifts in the core-level binding energies that originate from anionic Sn and Pb, consistent with density functional theory calculations. Near the surface, we observe additional signatures of neutral or cationic Sn and Pb, which may point to an electronic or atomic reconstruction with possible impact on putative topological surface states." @default.
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• W3100674758 date "2019-12-12" @default.
• W3100674758 modified "2023-10-01" @default.
• W3100674758 title "Unusual valence state in the antiperovskites <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>Sr</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi>SnO</mml:mi></mml:math> and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi>PbO</mml:mi></mml:mrow></mml:math> revealed by x-ray photoelectron spectroscopy" @default.
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• W3100674758 doi "https://doi.org/10.1103/physrevmaterials.3.124203" @default.
• W3100674758 hasPublicationYear "2019" @default.
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