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- W2120012304 abstract "We calculate the properties of the $4d$ ferromagnet ${text{SrRuO}}_{3}$ in bulk and thin film form with the aim of understanding the experimentally observed metal-to-insulator transition at reduced thickness. Although the spatial extent of the $4d$ orbitals is quite large, many experimental results have suggested that electron-electron correlations play an important role in determining this material's electronic structure. In order to investigate the importance of correlation, we use two approaches which go beyond the conventional local-density approximation to density-functional theory (DFT): the local spin-density $text{approximation}+text{Hubbard}$ $U$ $(text{LSDA}+U)$ and the pseudopotential self-interaction correction (pseudo-SIC) methods. We find that the details of the electronic structure predicted with the LSDA do not agree with the experimental spectroscopic data for bulk and thin film ${text{SrRuO}}_{3}$. Improvement is found by including electron-electron correlations, and we suggest that bulk orthorhombic ${text{SrRuO}}_{3}$ is a moderately correlated ferromagnet whose electronic structure is best described by a 0.6 eV on-site Hubbard term, or equivalently with corrections for the self-interaction error. We also perform ab initio transport calculations that confirm that ${text{SrRuO}}_{3}$ has a negative spin polarization at the Fermi level, due to the position of the minority $text{Ru}text{ }4d$ band center. Even with static correlations included in our calculations we are unable to reproduce the experimentally observed metal-insulator transition, suggesting that the electronic behavior of ${text{SrRuO}}_{3}$ ultrathin films might be dominated by extrinsic factors, such as surface disorder and defects, or due to dynamic spin correlations which are not included in our theoretical methods." @default.
- W2120012304 created "2016-06-24" @default.
- W2120012304 creator A5007838414 @default.
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- W2120012304 creator A5049903688 @default.
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- W2120012304 date "2008-10-07" @default.
- W2120012304 modified "2023-10-14" @default.
- W2120012304 title "Electronic properties of bulk and thin film<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>SrRuO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>: Search for the metal-insulator transition" @default.
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- W2120012304 doi "https://doi.org/10.1103/physrevb.78.155107" @default.
- W2120012304 hasPublicationYear "2008" @default.
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