Title :
Low-field magnetoresistance and magnetic study of Ba2Fe1+xMo1-xO6
Author :
Lee, W.Y. ; Han, H. ; Kim, S.-B. ; Kim, C.S. ; Lee, B.W.
Author_Institution :
Dept. of Phys., Hankuk Univ. of Foreign Studies, Kyungki, South Korea
fDate :
9/1/2002 12:00:00 AM
Abstract :
We have investigated low-field magnetoresistance (MR) and magnetic properties of Ba2Fe1+xMo1-xO6 (x=0-0.2) to point out some effects of Fe-Mo disorder between the Fe and Mo ions. Polycrystalline samples have been prepared by the conventional solid-state reaction in a stream of 5% H2-Ar gas. X-ray data indicate that the symmetry is cubic and the data are compatible with the Fm3m space group. All samples are single phase and exhibit a series of superstructure-reflection lines due to cation order of Fe and Mo. The magnitude of the negative MR is 2.9% for x=0 and 1.5% for x=0.2 at room temperature with magnetic fields of 7 kOe. Saturation magnetization is 2.8 μB/f.u. for x=0.2 which is smaller than the value of 3.8 μB/f.u. for x=0. This large variation of magnetization between x=0 and 0.2 arises from the disorder at the Fe and Mo sites.
Keywords :
X-ray diffraction; barium compounds; ferrimagnetic materials; iron compounds; magnetic hysteresis; magnetisation; magnetoresistance; molybdenum compounds; Ba2Fe1+xMo1-xO6; Fe-Mo disorder; Fm3m space group; H2-Ar gas stream; X-ray data; cation order; cubic symmetry; double perovskite; ferrimagnetic phase transition; low-field magnetoresistance; magnetic hysteresis loops; magnetic properties; negative magnetoresistance; polycrystalline samples; saturation magnetization; single phase samples; solid-state reaction; superstructure-reflection lines; Conductivity; Ferrimagnetic materials; Iron; Magnetoresistance; Physics; Powders; Saturation magnetization; Solid state circuits; Vibration measurement; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.802122
