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- W1976791057 abstract "Structural, magnetic and electrical properties of oxygen-deficient La0.6Sr0.4MnO3—δ with 0 ≤ δ ≤ 0.20 are presented. X-ray diffraction reveals a two-phase region separating a rhombohedral phase stable over 0 ≤ δ ≤ 0.127 and an orthorhombic phase stable in the range 0.15 ≤ δ ≤ 0.20. Transport and magnetic studies indicate that the magnetic coupling and the electronic properties are strongly dependent on the oxygen deficiency δ. Rhombohedral samples are ferromagnetic with Curie temperature TC varying with δ; TC reached a maximum of 367 K for δ = 0.025 which corresponds to a 54% Mn4+/Mn3+ ratio. Orthorhombic samples present an antiferromagnetic order. The magnetic interactions between manganese ions are estimated; their sign and magnitude confirms the obtained magnetic properties. The study of the electrical properties shows a semiconductor to metal transition as the temperature is lowered from 300 to 80 K for samples with oxygen vacancy 0 ≤ δ ≤ 0.10. A semiconductor behavior for La0.6Sr0.4MnO2.873 and an insulator one for 0.15 ≤ δ ≤ 0.20 are observed throughout the total temperature range studied. The electronic phase diagram in the plane of the temperature vs. oxygen deficiency δ has been deduced from the magnetic and electrical measurements." @default.
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- W1976791057 date "2001-12-01" @default.
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- W1976791057 title "Effect of the Oxygen Deficiency on the Structural, Magnetic and Electrical Properties in Perovskite-Like La0.6Sr0.4MnO3-?" @default.
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- W1976791057 doi "https://doi.org/10.1002/1521-396x(200112)188:3<1177::aid-pssa1177>3.0.co;2-7" @default.
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