Open AccessMagnetic properties and colossal magnetoresistance effect in perovskite-type manganite Ca(Mn2Cu1)Mn4O12
Author(s) -
Xia Hua,
Jun Yan,
Yu Jia,
Shiyuan Zhang
Publication year - 2004
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.53.2342
Subject(s) - materials science , antiferromagnetism , manganite , colossal magnetoresistance , magnetoresistance , condensed matter physics , impurity , magnetization , ferromagnetism , annealing (glass) , perovskite (structure) , magnetic field , saturation (graph theory) , chemistry , crystallography , physics , metallurgy , quantum mechanics , mathematics , organic chemistry , combinatorics
The perovskitetype manganites Ca(Mn2Cu1)Mn4O12 were prepared using the conventional solid state reaction method. X-ray diffraction patterns show that the annealing in air at 1073 K after the first sintering at higher temperatures can reduce the volumetric percentage of impurity phases in samples. Magnetic measurements indicate that the samples exhibit ferromagnetic antiferromagnetic transitions at low temperatures. Magnetization of the samples at 4.5 K is greatly decreased due to the existence of the antiferromagnetic phase, and shows no sign of saturation at 4.5 K and a magnetic field up to 8 T. The samples show semiconducting behavior. Their MR ratio reaches -35%—-46% at the temperature of 85 K and the magnetic field of 6 T.