Effect of A-site cation substitution on magnetic transition temperature of (LaCa) MnO3 |
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| Authors: | Kebin Li Shouguo Wang Rongsheng Cheng Xijun Li Denglu Hou Xiangfu Nie Yuheng Zhang |
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| Affiliation: | (1) Institute of Solid State Physics, Chinese Academy of Sciences, 230031 Hefei, China;(2) Structural Research Laboratory, University of Science and Technology of China, 230026 Hefei, China;(3) Department of Physics, Hebei Teacher’s College, 050016 Shijiazhuang, China |
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| Abstract: | The ferromagnetic transition temperatures have been measured on two bathes of perovskite manganese oxides such as (La1-x R x )2/3Ca1/3MnO3(R=Ce, Pr, Nd, etc.) and La2/3(Ca1-y Cd y )1/3MnO3. It is found that the (La1-x R x )2/3Ca1/3MnO3 samples have obviously different Curie temperatureT C although their (rA) (the average A-site cation radius) are almost identical, and theT C in the system of (La1-x R x )2/3Ca1/3MnO3(R=Ce, Pr, Nd, etc.) and La2/3(Ca1-y Cd y )1/3MnO3. It is found that the (La1-x R x )2/3Ca1/3MnO3 compounds increases with increasingy although (rA) decreases slightly. It is suggested that the Curie temperature should be influenced by the average local A-site magnetic moment in the ferromagnetic perovskite manganite system. Project supported by the National Natural Science Foundation of China (Grant No. 19504012) and the Chinese Academy of Sciences. |
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| Keywords: | colossal magnetoresistance Curie temperature (T c ) lattice effect |
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