Mossbauer studies of CMR compound La0.67Ca0.33Mn0.9757Fe0.03O3

被引:3
作者
Kim, CS
Park, SI
Oh, YJ
机构
[1] Kookmin Univ, Dept Phys, Songbuk Gu, Seoul 136702, South Korea
[2] Korea Inst Sci & Technol, Thin Film Technol Res Ctr, Seoul 130650, South Korea
关键词
sol-gel; colossal magnetoresistance; Mossbauer; anisotropic hyperfine field fluctuation;
D O I
10.1016/S0304-8853(00)00061-5
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The perovskite (La0.67Ca0.33Mn0.97Fe0.03O3)-Fe-57 compound has been prepared by sol-gel method. Colossal magnetoresistance and magnetic properties of (La0.67Ca0.33Mn0.97Fe0.03O3)-Fe-57 has been studied using X-ray diffraction pattern, Rutherford back-scattering spectroscopy, Miissbauer spectroscopy and vibrating sample magnetometer. Crystalline (La0.67Ca0.33Mo0.97Fe0.03O3)-Fe-57 was a cubic perovskite structure with a lattice parameter a(0) = 3.859 Angstrom. Mossbauer spectra of (La0.67Ca0.33Mn0.97Fe0.03O3)-Fe-57 have been taken at various temperatures ranging from 4.2 K to room temperature. Analysis of Fe-57 Mossbauer spectrum data has considered nearest-neighbor interactions and anisotropic hyperfine field fluctuation. Analysis of Fe-57 Mossbauer data in terms of the local configurations of Mn atoms has permitted the influence of the magnetic hyperfine interaction to be monitored. The saturation magnetization of (La0.67Ca0.33Mn0.97Fe0.03O3)-Fe-57 is found to be 68 emu/g at 77 K. The Curie temperature, T-C, is determined to be 210 K. The temperature dependence of the resistance under zero and 10 kOe applied field shows that a semiconductor-metal transition, TSC-M, occurs at 200 K. The relative magnetoresistance, MR, is about 45%. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:40 / 42
页数:3
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