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- W2000615178 abstract "Abstract A significant enhancement of low-field magnetoresistance (LFMR) was obtainable from the polycrystalline composites between La 0.7 Sr 0.3 MnO 3 (LSMO) and La 2 O 3 phases. For this study, the magnetic and magnetotransport properties of samples with various compositions of (1 − x )LSMO– x La 2 O 3 ( x = 0, 0.025, 0.05, 0.075, 0.1, 0.2, 0.3) were systematically investigated. Compared with pure LSMO ( T C = 362 K), all composites exhibited a slightly depressed T C values of 355–358 K, implying that the magnetic ordering of LSMO is insignificantly affected by chemically compatible La 2 O 3 . While the LFMR value at 300 K in 500 Oe was monotonously increased from 1.36 to 1.67% with increasing x from 0 to 0.075, it was abruptly increased to the maximum value of 2.22% for x = 0.1 with only one order increase in its resistivity relative to x = 0.075, and further increasing x from 0.1 to 0.3 resulted in a linear decrease to 1.8% with almost no variation in resistivity. This peculiar behavior, different from normal metallic percolation threshold effect, is closely related to the microstructure variation. Remarkably improved LFMR properties of the LSMO–La 2 O 3 composite samples are attributed to high grain boundary areal density and sharpening of a disordered LSMO grain boundary region acting as more effective spin-dependent scattering centers." @default.
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- W2000615178 date "2012-04-01" @default.
- W2000615178 modified "2023-10-16" @default.
- W2000615178 title "Enhanced low field magnetoresistance in La0.7Sr0.3MnO3–La2O3 composites" @default.
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- W2000615178 doi "https://doi.org/10.1016/j.jallcom.2011.12.121" @default.
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