Effect of A-site cation substitution on magnetic transition temperature of (LaCa) MnO3

The ferromagnetic transition temperatures have been measured on two bathes of perovskite manganese oxides such as (La1-xRx)2/3Ca1/3MnO3(R=Ce, Pr, Nd, etc.) and La2/3(Ca1-yCdy)1/3MnO3. It is found that the (La1-xRx)2/3Ca1/3MnO3 samples have obviously different Curie temperatureTC although their (rA)...

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Bibliographic Details
Published in:Science China. Mathematics 1999-07, Vol.42 (7), p.758-762
Main Authors: Li, Kebin, Wang, Shouguo, Cheng, Rongsheng, Li, Xijun, Hou, Denglu, Nie, Xiangfu, Zhang, Yuheng
Format: Article
Language:English
Subjects:
Cations
Curie temperature
Ferromagnetism
Magnetic moments
Magnetic transitions
Manganese oxides
Perovskites
Praseodymium
Transition temperature
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Summary:The ferromagnetic transition temperatures have been measured on two bathes of perovskite manganese oxides such as (La1-xRx)2/3Ca1/3MnO3(R=Ce, Pr, Nd, etc.) and La2/3(Ca1-yCdy)1/3MnO3. It is found that the (La1-xRx)2/3Ca1/3MnO3 samples have obviously different Curie temperatureTC although their (rA) (the average A-site cation radius) are almost identical, and theTC in the system of (La1-xRx)2/3Ca1/3MnO3(R=Ce, Pr, Nd, etc.) and La2/3(Ca1-yCdy)1/3MnO3. It is found that the (La1-xRx)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.
ISSN:1006-9283
1674-7283
1862-2763
1869-1862
DOI:10.1007/BF02878995