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• W29072760 startingPage "853" @default.
• W29072760 abstract "Thin films of La${}_{2}$SrCu${}_{2}$O${}_{6+y}$ with varying Sr/La ratios have been grown by molecular beam epitaxy on (001) SrTiO${}_{3}$; their structural as well as their transport properties are reported. Under appropriate conditions, thin films with a metal-like resistivity down to 8 K are obtained; i.e., these films are closer to the onset of superconductivity than previous results indicate for bulk samples. This observation might be explained by a thin-film-specific alteration in site occupation of the La and Sr atoms in the lattice. In addition, the defect structures of a typical sample have been studied by transmission electron microscopy and the thin-film/substrate interface structure is determined. Out-of-phase boundaries with displacement vectors $R=[00frac{1}{5}]$ occur throughout the entire film thickness. Such interfaces, which possibly originate at substrate surface steps, disconnect the CuO${}_{2}$ layers and negatively influence eventual superconductivity. The films contain copper oxide outgrowths and nano-sized $a$-axis grains at the surface. Locally a $2sqrt{2}{a}_{p}ifmmodetimeselsetexttimesfi{}2sqrt{2}{a}_{p}$ modulation is observed; we have determined its unit cell and compared it with other so-called $2sqrt{2}{a}_{p}ifmmodetimeselsetexttimesfi{}2sqrt{2}{a}_{p}$ structures occurring in other superconducting compounds such as YBa${}_{2}$Cu${}_{3}$O${}_{7ensuremath{-}d}$ and Bi${}_{1.8}$Pb${}_{0.4}$Sr${}_{2}$Ca${}_{2}$Cu${}_{3}$O${}_{10+x}.$" @default.
• W29072760 created "2016-06-24" @default.
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• W29072760 date "1997-07-01" @default.
• W29072760 modified "2023-09-25" @default.
• W29072760 title "Molecular beam epitaxy and microstructural study of La<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Sr<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>+</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Cu<mml:math …" @default.
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• W29072760 doi "https://doi.org/10.1103/physrevb.56.853" @default.
• W29072760 hasPublicationYear "1997" @default.
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