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• W2026511034 abstract "Abstract We report here the preparation and properties of La 1 −  x Ag y MnO 3 +  δ thin epitaxial films. The original two-step preparation procedure was developed. At first, La 1 −  x MnO 3 +  δ were grown epitaxially by metal–organic chemical vapor deposition on the single-crystal substrates (001) and (110) SrTiO 3 , (001) LaAlO 3 , (111) and (001) ZrO 2 (Y 2 O 3 ). Treatment by the vapor of the metallic silver in the oxygen atmosphere (at 1 bar and 20 bar) was the second step resulting in the selective absorption of silver by La 1 −  x MnO 3 +  δ phase. The value of y depended on the process conditions and revealed different kinetics of the silver absorption for (001) and (110) orientation of La 1 −  x MnO 3 +  δ films. The films prepared were characterized by X-ray diffraction, scanning electron microscopy with energy-dispersion X-ray analysis, high resolution transmission electron microscopy, X-ray photoelectron spectroscopy, electrical resistivity and magnetoresistance measurements in a four-probe configuration. We have found that metal-insulator transition temperature ( T p ) in the series La 1 −  x Ag x MnO 3 +  δ possessed a maximum of 380 K at x  = 0.15. Thus, T p of La 1 −  x Ag x MnO 3 +  δ films was significantly higher than ever reported in the literature for the La 1 −  x Ag x MnO 3 +  δ ceramics. La 1 −  x Ag x MnO 3 +  δ films demonstrated the important role of the ferromagnetic fluctuations above Curie temperature T c resulting in the sign change of the resistivity curve temperature slope d R  / d T and a significant shift of T p well above T c . The maximum of the magnetoresistance on the temperature scale was close to d R  / d T maximum. The intrinsic magnetoresistance values as high as 22% at 310 K and 50% at 280 K were measured in the magnetic field of 1 T in the series of La 1 −  x Ag y MnO 3 +  δ epitaxial films." @default.
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• W2026511034 date "2008-04-01" @default.
• W2026511034 modified "2023-09-25" @default.
• W2026511034 title "Preparation and properties of La1−xAgyMnO3+δ thin epitaxial films" @default.
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• W2026511034 doi "https://doi.org/10.1016/j.tsf.2007.06.120" @default.
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