Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9803777 | Journal of Alloys and Compounds | 2005 | 5 Pages |
Abstract
We have prepared a series of bulk polycrystalline manganites with the nominal compositions, Nd0.7Sr0.3MnO3-Agx (x is the molar fraction) with x = 0.1, 0.2, 0.3, 0.4, 0.5 by conventional solid-state reaction. The X-ray diffraction patterns show that the sample Nd0.7Sr0.3MnO3 (x = 0) is a single-phase compound with the pseudocubic perovskite structure, while the Ag-doped samples are two-phase composites consisting of a ferromagnetic perovskite phase and a nonmagnetic Ag metal phase. For all the samples, the Curie temperature, TC, remains nearly the same (228 ± 2 K), but the maximum magnetoresistance in a magnetic field of 1 T at 222 K is enhanced strongly due to the addition of Ag, namely, from 45% for the Nd0.7Sr0.3MnO3 sample to 188, 277, 142, 158 and 151% for the Nd0.7Sr0.3MnO3-Agx samples with x = 0.1, 0.2, 0.3, 0.4, and 0.5, respectively. This magnetoresistance-enhancement phenomenon can be attributed to the spin-dependent scattering of the spin-polarized electrons at the interfaces between the perovskite grains and the Ag granules.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Xugao Cui, Xiukun Hu, Hongxu Xia, Jiangying Yu, Shiyuan Zhang,